First version of dind repo

.arg

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+DOCKERHUB_USER=earthly
+IMAGE_NAME=dind
+EARTHLY_REPO_VERSION=ido-dind-preparations

.github/CODEOWNERS

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+# PRs require approval from the earthly core team
+* @earthly/core

.github/renovate.json5

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+{
+  $schema: "https://docs.renovatebot.com/renovate-schema.json",
+  extends: [
+    "config:recommended"
+  ],
+  configMigration: true,
+  prHourlyLimit: 1,
+  schedule: [ // utc timezone
+    'after 6am on monday',
+  ],
+  enabledManagers: [
+    'dockerfile',
+    'custom.regex',
+    'github-actions',
+  ],
+  dockerfile: {
+    fileMatch: [
+      'Earthfile',
+    ],
+  },
+  customManagers: [
+    {
+      // Earthly Version in GH Actions
+      customType: 'regex',
+      fileMatch: [
+        '.*?\\.yml', 
+      ],
+      matchStrings: [
+        '- uses: earthly/actions/setup-earthly@.*?[\\s\\n]+.*?[\\s\\n]+with:[\\s\\n]*version: (?<currentValue>.*?)[\\s\\n/]+',
+      ],
+      depNameTemplate: 'earthly/earthly',
+      datasourceTemplate: 'github-releases',
+    },
+    {
+      // ARG/LET in Earthfile that have a Renovate comment
+      customType: 'regex',
+      fileMatch: [
+        'Earthfile',
+      ],
+      matchStrings: [
+        '\\s*#\\s*renovate:\\s*datasource=(?<datasource>.*?)\\s+depName=(?<depName>.*?)[\\s\\n]+(versioning=(?<versioning>.*?)\\s+)?(ARG|LET)\\s+.*?(_VERSION|_VER|version)=(?<currentValue>.*?)($|\\s|\\n)',
+      ],
+    },
+    {
+      // Updating the Repology alpine version
+      customType: 'regex',
+      fileMatch: [
+        'Earthfile',
+      ],
+      matchStrings: [
+        '# renovate: datasource=repology depName=alpine_(?<currentValue>\\d+_\\d+)',
+      ],
+      currentValueTemplate: "{{{ replace '_' '.' currentValue }}}",
+      datasourceTemplate: 'docker',
+      depNameTemplate: 'alpine',
+      versioningTemplate: 'regex:^(?<major>\\d+)[._](?<minor>\\d+)$',
+      autoReplaceStringTemplate: '# renovate: datasource=repology depName=alpine_{{{newMajor}}}_{{{newMinor}}}',
+    },
+    {
+      // Updating the commit hash of earthly/earthly
+      customType: 'regex',
+      fileMatch: ['^\\.arg$'],
+      matchStrings: [
+        'EARTHLY_REPO_VERSION=(?<currentDigest>.*?)($|\\s|\\n)',
+      ],
+      currentValueTemplate: 'main',
+      depNameTemplate: 'earthly/earthly',
+      packageNameTemplate: 'https://github.com/earthly/earthly',
+      datasourceTemplate: 'git-refs',
+    },
+  ],
+  labels: [
+    'renovate',
+  ],
+  packageRules: [
+    // set the group name for alpine dind dependencies
+    {
+      groupName: "{{{ replace 'os\\/(.*?)$' '$1' packageFileDir}}}-dind-image",
+      matchPackagePatterns: [
+        'alpine',
+        'alpine.*?/docker',
+        'docker/docker',
+      ],
+      matchManagers: [
+        'custom.regex',
+      ],
+      matchDatasources: [
+        'docker',
+        'repology',
+        'github-releases',
+      ],
+      matchFileNames: [
+        'os/**/Earthfile',
+      ],
+    },
+    {
+      // let all package updates auto merge
+      matchPackagePatterns: [ '*' ],
+      automerge: true,
+    },
+  ],
+}

.github/workflows/ci.yml

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+name: CI
+
+on:
+  # TODO: enable when this bug is resolved: https://github.com/earthly/earthly/issues/3930
+  # push:
+  #   branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    name: test
+    runs-on: ubuntu-latest
+    env:
+      FORCE_COLOR: 1
+      EARTHLY_CONVERSION_PARALLELISM: "5"
+      EARTHLY_TOKEN: "${{ secrets.EARTHLY_TOKEN }}"
+      EARTHLY_INSTALL_ID: "earthly-dind-githubactions"
+    steps:
+      - uses: earthly/actions/setup-earthly@v1
+        with:
+          version: v0.8.5
+      - uses: actions/checkout@v4
+      - name: Docker login (non fork only)
+        run: |-
+          docker login --username "${{ secrets.DOCKERHUB_USERNAME }}" --password "${{ secrets.DOCKERHUB_TOKEN }}"
+          docker login registry-1.docker.io.mirror.corp.earthly.dev --username "${{ secrets.DOCKERHUB_MIRROR_USERNAME }}" --password "${{ secrets.DOCKERHUB_MIRROR_PASSWORD }}"
+        if: github.event.pull_request.head.repo.full_name == github.repository
+      - name: Configure Earthly to use mirror (non fork only)
+        run: |-
+          earthly config global.buildkit_additional_config "'[registry.\"docker.io\"]
+          mirrors = [\"registry-1.docker.io.mirror.corp.earthly.dev\"]'"
+        if: github.event.pull_request.head.repo.full_name == github.repository
+      - name: Run tests
+        run: earthly --ci -P --push --org earthly-technologies --satellite dind +test

.github/workflows/release.yml

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+name: Release
+
+on:
+  pull_request_target:
+    types: [ closed ]
+
+jobs:
+  release:
+    name: release after merging ${{ github.head_ref }}
+    if: github.event.pull_request.merged == true && startsWith(github.head_ref, 'renovate/') && endsWith(github.head_ref, '-dind-image')
+    runs-on: ubuntu-latest
+    env:
+      FORCE_COLOR: 1
+      EARTHLY_CONVERSION_PARALLELISM: "5"
+      EARTHLY_TOKEN: "${{ secrets.EARTHLY_TOKEN }}"
+      EARTHLY_INSTALL_ID: "earthly-dind-githubactions"
+    steps:
+      - uses: earthly/actions/setup-earthly@v1
+        with:
+          version: v0.8.5
+      - uses: actions/checkout@v4
+      - name: Docker login (non fork only)
+        run: |-
+          docker login --username "${{ secrets.DOCKERHUB_USERNAME }}" --password "${{ secrets.DOCKERHUB_TOKEN }}"
+          docker login registry-1.docker.io.mirror.corp.earthly.dev --username "${{ secrets.DOCKERHUB_MIRROR_USERNAME }}" --password "${{ secrets.DOCKERHUB_MIRROR_PASSWORD }}"
+        if: github.event.pull_request.head.repo.full_name == github.repository
+      - name: Configure Earthly to use mirror (non fork only)
+        run: |-
+          earthly config global.buildkit_additional_config "'[registry.\"docker.io\"]
+          mirrors = [\"registry-1.docker.io.mirror.corp.earthly.dev\"]'"
+        if: github.event.pull_request.head.repo.full_name == github.repository
+      - name: Build & Push image
+        run: earthly --ci -P --push --org earthly-technologies --satellite dind +release --RENOVATE_BRANCH=${{github.head_ref}}

CONTRIBUTING.md

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+# Contributing
+
+## Code of Conduct
+
+Please refer to the [CNCF Community Code of Conduct v1.0](https://github.com/cncf/foundation/blob/main/code-of-conduct.md)
+
+## CLA
+
+### Individual
+
+All contributions must indicate agreement to the [Earthly Contributor License Agreement](https://gist.github.com/vladaionescu/ed990fa149a38a53ac74b64155bc6766) by logging into GitHub via the CLA assistant and signing the provided CLA. The CLA assistant will automatically notify the PRs that require CLA signing.
+
+### Entity
+
+If you are an entity, please use the [Earthly Contributor License Agreement form](https://earthly.dev/cla-form) in addition to requiring your individual contributors to sign all contributions.

Earthfile

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+VERSION --wildcard-builds 0.8
+
+PROJECT earthly-technologies/core
+
+# test runs tests for all defined dind images in this repo
+test:
+    BUILD --pass-args ./os/*+test-build
+
+# release expects to get a renovate branch in the form of renovate/<os>-dind-image, extracts the os and then kicks off its +release target
+# this is meant to be run by a github workflow
+release:
+    FROM alpine
+    # RENOVATE_BRANCH is the renovate branch that is expected to get merged and trigger this target
+    ARG --required RENOVATE_BRANCH
+    LET os=${RENOVATE_BRANCH#renovate/}
+    # using a LET/SET in the target path does not work, use an ARG instead until it's fixed
+    ARG OS=${os%-dind-image}
+    BUILD --pass-args ./os/$OS+release