Better handling of docker tags

This should result in more sane docker tags

Author: mich181189

.github/workflows/build-tags.yaml

@@ -16,14 +16,21 @@ jobs:
           registry: docker.pkg.github.com
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        with:
+          images: docker.pkg.github.com/londonhackspace/kube-auth-handler/server
+          flavor: |
+            latest=false
       - name: Build and push
         uses: docker/build-push-action@v2
         with:
           context: .
           platforms: linux/amd64
           push: true
-          tags: |
-            docker.pkg.github.com/londonhackspace/kube-auth-handler/server:${GITHUB_REF##*/}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
   build_client:
     name: Build Clients
     runs-on: ubuntu-latest
@@ -46,4 +53,4 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           ISSUE: ${{ github.event.issue.html_url }}
-        run: gh release create ${GITHUB_REF##*/} ldap-kube-auth_*
+        run: gh release create ${GITHUB_REF##*/} auth-client/ldap-kube-auth_*