add github action

Signed-off-by: Bill Maxwell <[email protected]>

.github/workflows/publish.yaml

@@ -0,0 +1,34 @@
+name: Publish Acorn image
+on:
+  push:
+    tags:
+      - "v[0-9]*"
+
+jobs:
+  publish:
+    name: Publish
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - uses: acorn-io/actions-setup@v2
+        with:
+          acorn-version: "main"
+      - name: Login to GHCR
+        uses: acorn-io/actions-login@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and Publish Acorn image
+        run: |
+          TAG=${GITHUB_REF#refs/*/}
+          USER=${{ github.repository_owner }}
+          REPO=${{ github.event.repository.name }}
+          acorn build --platform linux/amd64 --push -t ghcr.io/$USER/$REPO:$TAG .
+          acorn build --platform linux/amd64 --push -t ghcr.io/$USER/$REPO/examples:$TAG examples