github: add a staging workflow & update the name of others

.github/workflows/docker-develop.yml

@@ -1,4 +1,4 @@
-name: Build Docker development image
+name: Build development Docker image
 
 on:
   workflow_dispatch:

.github/workflows/docker-staging.yml

@@ -0,0 +1,55 @@
+name: Build staging Docker image
+
+on:
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Get release metadata
+        id: release-meta
+        run: |
+            version=$(cat package.json | jq -r .version)
+            echo "commit_short=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+            echo "version=$version" >> $GITHUB_OUTPUT
+            echo "major_version=$(echo "$version" | cut -d. -f1)" >> $GITHUB_OUTPUT
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          tags: type=raw,value=staging
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: linux/amd64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

.github/workflows/docker.yml

@@ -1,4 +1,4 @@
-name: Build Docker image
+name: Build release Docker image
 
 on:
   workflow_dispatch: