add a publishing workflow (#1)

Author: keewis

.github/workflows/packages.yml

@@ -0,0 +1,37 @@
+name: packages
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - "*"
+  workflow_dispatch:
+
+jobs:
+  docker-build-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3.4.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5.7.0
+        with:
+          images: ghcr.io/IAOCEA/copernicus-marine
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6.15.0
+        with:
+          context: .
+          file: Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}