Container image publishing workflow

.github/workflows/publish-container.yml

@@ -0,0 +1,54 @@
+# Action to build container image and publish to
+# GitHub Container Registry (ghcr.io). This runs
+# only for pushes to the master branch such as a merge.
+
+name: Package and publish container image
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - "*"
+
+jobs:
+  publish:
+    name: Package and publish container image
+    runs-on: ubuntu-22.04
+
+    steps:
+      # SHA tag for every push to master
+      # "edge" tag for every push to master
+      # semver tag for every tag push matching semver
+      # latest for the newest tag semver tag push
+      - name: Generate docker image meta tags
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/bluehatbrit/mdpdf
+          flavor: |
+            latest=true
+          tags: |
+            type=sha,event=push,branch=$repo.default_branch,prefix=
+            type=edge,event=push,branch=$repo.default_branch
+            type=semver,pattern={{version}},prefix=v
+
+      - name: Setup Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: bluehatbrit
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and publish
+        id: docker_build
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}