Add CI job for MediaWiki

.woodpecker/mediawiki.yaml

@@ -0,0 +1,25 @@
+when:
+  - event: push
+    branch: main
+    path:
+      - "mediawiki/**"
+      - ".woodpecker/mediawiki.yaml"
+  - event: tag
+    ref: "refs/tags/mediawiki/*"
+
+steps:
+  - name: build
+    image: quay.io/buildah/stable
+    commands:
+      - buildah build --manifest dev.ccchb.de/ccchb/oci-images/mediawiki keycloak/
+      - buildah manifest push --all dev.ccchb.de/ccchb/oci-images/mediawiki oci-archive:/woodpecker/image.tar
+    privileged: true
+  - name: push
+    image: quay.io/skopeo/stable
+    commands:
+      - "skopeo copy --dest-creds ccchb:$${FORGEJO_API_TOKEN} oci-archive:/woodpecker/image.tar docker://dev.ccchb.de/ccchb/oci-images/mediawiki:$${CI_COMMIT_TAG##mediawiki/}"
+      - "skopeo copy --dest-creds ccchb:$${FORGEJO_API_TOKEN} oci-archive:/woodpecker/image.tar docker://dev.ccchb.de/ccchb/oci-images/mediawiki:latest"
+    secrets:
+      - FORGEJO_API_TOKEN
+    when:
+      event: tag