ci: split up into multiple workflows

* ci: split up workflows

* ci: tweaks and housekeeping

* ci: additional comments and requested changes

* ci: additional comments

* chore: clean up .gitignore

.github/workflows/docker.yml

@@ -0,0 +1,94 @@
+name: Docker
+
+on:
+  workflow_call:
+    secrets:
+      DOCKERHUB_TOKEN:
+        required: true
+      DOCKERHUB_USERNAME:
+        required: true
+
+jobs:
+
+  docker-meta:
+  # Generates the metadata (labels and tags) for the docker containers
+  #   - push to main results in the edge tag
+  #   - version tag results in edge, latest and semver, major, major.minor tags
+  #   - push to versions/ results in the next tag
+    runs-on: ubuntu-latest
+    outputs:
+      labels: ${{ steps.meta-main.outputs.labels || steps.meta-version.outputs.labels }}
+      tags: ${{ steps.meta-main.outputs.tags || steps.meta-version.outputs.tags }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - if: startsWith(github.ref, 'refs/tags/v') || (github.ref == 'refs/heads/main')
+        name: Docker meta edge and version tag
+        id: meta-main
+        uses: docker/metadata-action@v4
+        with:
+          images: |
+            solidproject/community-server
+          # edge will always be executed (without latest tag), semver only on tag push events (with latest tag)
+          tags: |
+            type=edge
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+          github-token: ${{ secrets.github_token }}
+      - if: startsWith(github.ref, 'refs/heads/versions/')
+        name: Docker meta next
+        id: meta-version
+        uses: docker/metadata-action@v4
+        with:
+          images: |
+            solidproject/community-server
+          # Just one label: next (no latest here) for the last pushed commit on this branch
+          tags: |
+            type=raw,value=next
+          github-token: ${{ secrets.github_token }}
+
+  docker:
+  # Builds, tests and pushes docker containers
+  # Containers are built for both linux/amd64 and linux/arm/v7 platforms
+    needs: docker-meta
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Login to DockerHub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build and export to docker
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          load: true
+          tags: ${{ needs.docker-meta.outputs.tags }}
+          labels: ${{ needs.docker-meta.outputs.labels }}
+
+      - name: "Test all docker-built image tags"
+        shell: bash
+        # Loop over all generated image:tag names and docker run them.
+        # If they aren't built previously, the command will error.
+        # If they don't work, the job will fail.
+        # If they work the --version argument should return a version and the job succeeds.
+        run: |
+          while read i; do
+            docker run --rm --pull never $i --version
+          done <<< "${{ needs.docker-meta.outputs.tags }}";
+
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          push: true
+          platforms: linux/amd64,linux/arm/v7
+          tags: ${{ needs.docker-meta.outputs.tags }}
+          labels: ${{ needs.docker-meta.outputs.labels }}