feat(artifacthub): push artifacthub-repo.yml file to oci repository

.github/workflows/publish.yml

@@ -65,3 +65,11 @@ jobs:
             helm push "${pkg}" oci://ghcr.io/"${GITHUB_REPOSITORY_OWNER}"/charts |& tee .digest
             cosign sign $(cat .digest | awk -F "[, ]+" '/Pushed/{print $NF}')
           done
+      - uses: oras-project/setup-oras@v1
+        with:
+          version: 1.2.0
+      - name: Push chart to GHCR
+        run: |
+          oras push ghcr.io/"${GITHUB_REPOSITORY_OWNER}"/charts/opencost \
+          --config /dev/null:application/vnd.cncf.artifacthub.config.v1+yaml \
+          artifacthub-repo.yml:application/vnd.cncf.artifacthub.repository-metadata.layer.v1.yaml

artifacthub-repo.yml

@@ -0,0 +1,13 @@
+# Artifact Hub repository metadata file
+#
+# Some settings like the verified publisher flag or the ignored packages won't
+# be applied until the next time the repository is processed. Please keep in
+# mind that the repository won't be processed if it has not changed since the
+# last time it was processed. Depending on the repository kind, this is checked
+# in a different way. For Helm http based repositories, we consider it has
+# changed if the `index.yaml` file changes. For git based repositories, it does
+# when the hash of the last commit in the branch you set up changes. This does
+# NOT apply to ownership claim operations, which are processed immediately.
+#
+# Repository: opencost-oci
+repositoryID: fc0e734e-ecc9-4351-96e6-0c8934a1b8b1