fix(ci): upload artifacthub.yaml into OCI registry

.gitea/workflows/artifacthub-metadata.yaml

@@ -0,0 +1,47 @@
+name: Upload ArtifactHub Metadata
+
+on:
+  schedule:
+    - cron: '0 3 1 * *' 
+  workflow_dispatch: 
+
+jobs:
+  upload-metadata:
+    name: "Upload artifacthub-repo.yml to OCI registry"
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v6.0.2
+    - uses: oras-project/setup-oras@v1.2.1
+      with:
+        version: 1.2.2 # renovate: datasource=github-tags depName=oras-project/oras extractVersion='^v?(?<version>.*)$'
+    - name: Login to OCI registry
+      run: |
+        echo "${{ secrets.GIT_CRYPTIC_SYSTEMS_PACKAGE_REGISTRY_TOKEN }}" | \
+          oras login git.cryptic.systems \
+            --username ${{ github.repository_owner }} \
+            --password-stdin
+
+    - name: Push artifacthub-repo.yml to git.cryptic.systems
+      run: |
+        oras push git.cryptic.systems/volker.raschek/dcmerge:artifacthub.io \
+          --config /dev/null:application/vnd.cncf.artifacthub.config.v1+yaml \
+          artifacthub-repo.yml:application/vnd.cncf.artifacthub.repository-metadata.layer.v1.yaml
+
+    - name: Login to docker.io
+      run: |
+        echo "${{ secrets.DOCKER_IO_PASSWORD }}" | \
+          oras login docker.io \
+            --username ${{ secrets.DOCKER_IO_USERNAME }} \
+            --password-stdin
+
+    - name: Push artifacthub-repo.yml to docker.io
+      run: |
+        oras push docker.io/volkerraschek/dcmerge:artifacthub.io \
+          --config /dev/null:application/vnd.cncf.artifacthub.config.v1+yaml \
+          artifacthub-repo.yml:application/vnd.cncf.artifacthub.repository-metadata.layer.v1.yaml
+
+    - name: Logout from registries
+      if: always()
+      run: |
+        oras logout git.cryptic.systems
+        oras logout docker.io