feat: Add binaries / Docker images to GitHub releases (#1259)

- Add binaries / Docker images to GitHub releases

.github/workflows/release.yaml

@@ -0,0 +1,64 @@
+name: Release workflow - Add the docker hub link to the release notes
+
+on:
+  release:
+    types:
+      - published
+
+permissions:
+  actions: write
+  contents: read
+  issues: write
+
+jobs:
+  manual-approval:
+    name: Waiting for manual approval
+    runs-on: ubuntu-latest
+
+    steps: 
+      - name: Wait for manual approval
+        uses: trstringer/manual-approval@662b3ddbc7685f897992051e87e1b4b58c07dc03 #v1.9.1
+        with:
+          secret: ${{ github.TOKEN }}
+          approvers: fabergat, aldur, matteojug, djordon
+          minimum-approvals: 1
+          issue-title: "Add Docker Hub link to the ${{ github.event.release.tag_name }} release notes"
+          issue-body: "Please approve or deny the ${{ github.ref_name }}. Wait the Build and Release sBTC Signer ${{ github.event.release.tag_name }} Docker Image workflow finish with a success."
+          exclude-workflow-initiator-as-approver: false
+
+  update-release:
+    name: Update Release Page
+    permissions: write-all
+    runs-on: ubuntu-latest
+    needs: manual-approval
+
+    steps:
+      - name: Get Docker Image Digest
+        id: docker-info
+        run: |
+          DOCKER_REPO="blockstack/sbtc"
+          TAG=${{ github.event.release.tag_name }}
+          DIGEST=$(curl -s https://hub.docker.com/v2/repositories/$DOCKER_REPO/tags/signer-$TAG | jq -r '.images[0].digest')
+          echo "link=hub.docker.com/layers/$DOCKER_REPO/signer-$TAG/images/$DIGEST" >> $GITHUB_ENV
+
+      - name: Update Release with Docker Image Link
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea #v7.0.1
+        with:
+          script: |
+            const link = process.env.link;
+
+            await github.rest.repos.updateRelease({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              release_id: context.payload.release.id,
+              body: 
+                `
+                ${context.payload.release.body}
+                
+                **Release Docker Image:** [https://${link}](https://${link})
+                
+                You can verify the attestation using this [guide](https://docs.github.com/en/actions/security-for-github-actions/using-artifact-attestations/using-artifact-attestations-to-establish-provenance-for-builds#verifying-artifact-attestations-with-the-github-cli).
+                `
+            });
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}