Publish images to GHCR and releases to the GitHub mirror

- retag+push the same :latest/:X.Y/:X.Y.Z tags to ghcr.io/djeex/lumeex
- create a matching GitHub Release on the Djeex/lumeex mirror, same changelog
  body prefixed with a notice pointing back to the git.djeex.fr source repo
- targets the exact commit SHA (not the branch) with retries, since the
  Gitea->GitHub push mirror can lag behind this job
- requires a new GH_TOKEN secret (repo + write:packages) — not created yet
- first GHCR push per repo will be private by default; GitHub has no API to
  default it public for a personal account, needs a one-time manual toggle

.gitea/workflows/ci.yml

@@ -185,6 +185,16 @@ jobs:
           docker push "$IMAGE:$MINOR_TAG"
           docker push "$IMAGE:$VERSION"
 
+          GHCR_IMAGE=ghcr.io/djeex/lumeex
+          echo "${{ secrets.GH_TOKEN }}" | docker login ghcr.io -u Djeex --password-stdin
+
+          docker tag lumeex:ci "$GHCR_IMAGE:latest"
+          docker tag lumeex:ci "$GHCR_IMAGE:$MINOR_TAG"
+          docker tag lumeex:ci "$GHCR_IMAGE:$VERSION"
+          docker push "$GHCR_IMAGE:latest"
+          docker push "$GHCR_IMAGE:$MINOR_TAG"
+          docker push "$GHCR_IMAGE:$VERSION"
+
           TRIGGER_MSG=$(git log -1 --format=%s "${{ github.sha }}")
           PR_NUM=$(echo "$TRIGGER_MSG" | grep -oE '#[0-9]+' | head -1 | tr -d '#' || true)
 
@@ -244,3 +254,32 @@ jobs:
             -H "Content-Type: application/json" \
             -d "$JSON_PAYLOAD" \
             "https://git.djeex.fr/api/v1/repos/Djeex/lumeex/releases"
+
+          MIRROR_NOTICE="_This github repo is a mirror of https://git.djeex.fr/Djeex/lumeex. You'll find full package, PR, history and release note there._"
+          GH_BODY=$(printf '%s\n\n%s' "$MIRROR_NOTICE" "$BODY")
+
+          GH_JSON_PAYLOAD=$(jq -n \
+            --arg tag "$VERSION" \
+            --arg name "$VERSION" \
+            --arg body "$GH_BODY" \
+            --arg sha "${{ github.sha }}" \
+            '{tag_name: $tag, name: $name, target_commitish: $sha, body: $body}')
+
+          GH_STATUS=0
+          for i in 1 2 3 4 5; do
+            GH_STATUS=$(curl -s -o /tmp/gh_release.json -w "%{http_code}" -X POST \
+              -H "Authorization: Bearer ${{ secrets.GH_TOKEN }}" \
+              -H "Accept: application/vnd.github+json" \
+              -H "Content-Type: application/json" \
+              -d "$GH_JSON_PAYLOAD" \
+              "https://api.github.com/repos/Djeex/lumeex/releases")
+            if [ "$GH_STATUS" = "201" ]; then
+              break
+            fi
+            echo "GitHub Release attempt $i failed (HTTP $GH_STATUS) — mirror may not have synced this commit yet, retrying in 15s..."
+            sleep 15
+          done
+          echo "GitHub Release API response: $GH_STATUS"
+          if [ "$GH_STATUS" != "201" ]; then
+            cat /tmp/gh_release.json 2>/dev/null || true
+          fi