publish docker image

.github/workflows/docker.yml

@@ -0,0 +1,29 @@
+name: Docker Image
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  merge_group:
+
+jobs:
+  docker_image:
+    name: Docker Image (Postgres Migration)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+      - uses: hadolint/hadolint-action@54c9adbab1582c2ef04b2016b760714a4bfde3cf # v3.1.0
+      - uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3
+      - uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - run: echo "LATEST_MIGRATION_NAME=$(ls -1 --ignore migration_lock.toml ./migrations --reverse | head -n 1)" >> $GITHUB_ENV
+      - uses: docker/build-push-action@4a13e500e55cf31b7a5d59a38ab2040ab0f42f56 # v5
+        with:
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          push: ${{ github.event_name == 'push' }}
+          tags: ghcr.io/${{ github.repository_owner }}/postgres-migration:${{ env.LATEST_MIGRATION_NAME }}