ci: add oci-factory publishing

.github/workflows/publish.yaml

@@ -64,3 +64,28 @@ jobs:
       id: set
       run: echo "image=$image" >> "$GITHUB_OUTPUT"
 
+  oci-factory:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4
+      # install oci-factory via golang and set path in environment
+      - name: Install oci-factory
+        run: |
+          sudo apt update && sudo apt install -y golang-go git
+          go install github.com/canonical/oci-factory/tools/cli-client/cmd/oci-factory@77149f17e36362e5180ac283614421b9e9cfc3e9
+          GO111MODULE=on go install github.com/mikefarah/yq/[email protected]
+          echo "OCI_FACTORY=$(go env GOPATH)/bin/oci-factory" >> $GITHUB_ENV
+          echo "YQ=$(go env GOPATH)/bin/yq" >> $GITHUB_ENV
+      - name: Set EOLs and version
+        run: |
+          echo EOL_STABLE=$(date -d "$(date +'%Y-%m-%d') +6 month" +%Y-%m-%d") >> $GITHUB_ENV
+          echo EOL_CANDIDATE=$(date -d "$(date +'%Y-%m-%d') +14 day" +%Y-%m-%d") >> $GITHUB_ENV
+          echo IMAGE_VERSION_STABLE=$($YQ '.version | split(".").0' rockcraft.yaml) >> $GITHUB_ENV
+          echo IMAGE_VERSION_CANDIDATE=$($YQ '.version' rockcraft.yaml) >> $GITHUB_ENV
+      - name: Release
+        run: |
+          $OCI_FACTORY upload --release track=$IMAGE_VERSION_STABLE-22.04,risk=stable,eol=$EOL_STABLE
+          $OCI_FACTORY upload --release track=$IMAGE_VERSION_CANDIDATE-22.04,risk=candidate,edge,eol=$EOL_CANDIDATE
+        env:
+          GITHUB_TOKEN: ${{ secrets.PAT_TOKEN }}