Update Gitea URL variable in release workflow and README documentation

.gitea/workflows/release_jellyfin_plugin.yml

@@ -80,7 +80,7 @@ jobs:
         env:
           GITEA_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           # Public base URL for manifest sourceUrl (no trailing slash), e.g. https://gitea.example.com
-          GITEA_PUBLIC_URL: ${{ secrets.GITEA_PUBLIC_URL }}
+          PUBLIC_GITEA_URL: ${{ secrets.PUBLIC_GITEA_URL }}
           PLUGINS: ${{ steps.detect.outputs.plugins }}
         run: |
           set -euo pipefail
@@ -89,9 +89,16 @@ jobs:
             echo "Secret PUBLIC_GITEA_URL is not set (public Gitea base URL for plugin catalog sourceUrl)"
             exit 1
           fi
+
+          # API calls use the runner-reachable Gitea URL; catalog links use the public URL
           GITEA_API_URL="${{ github.server_url }}"
+          PUBLIC_GITEA_URL="${PUBLIC_GITEA_URL%/}"
           REPO_OWNER="${{ github.repository_owner }}"
           REPO_NAME="${{ github.event.repository.name }}"
+
+          git config user.name "gitea-actions"
+          git config user.email "actions@local"
+
           manifest_dirty=0
           while IFS= read -r SLUG; do
             [[ -z "$SLUG" ]] && continue
@@ -160,7 +167,7 @@ jobs:
               --data-binary "@${ARTIFACT}" \
               "${GITEA_API_URL}/api/v1/repos/${REPO_OWNER}/${REPO_NAME}/releases/${RELEASE_ID}/assets?name=${ARTIFACT_NAME}"
 
-            DOWNLOAD_URL="${GITEA_PUBLIC_URL}/${REPO_OWNER}/${REPO_NAME}/releases/download/${TAG}/${ARTIFACT_NAME}"
+            DOWNLOAD_URL="${PUBLIC_GITEA_URL}/${REPO_OWNER}/${REPO_NAME}/releases/download/${TAG}/${ARTIFACT_NAME}"
             TIMESTAMP=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
             GUID=$(grep -E '^guid:' "${PLUGIN_DIR}/build.yaml" | head -1 | sed -E 's/guid:[[:space:]]*"?([^"]*)"?/\1/')
             TARGET_ABI=$(grep -E '^targetAbi:' "${PLUGIN_DIR}/build.yaml" | head -1 | sed -E 's/targetAbi:[[:space:]]*"?([^"]*)"?/\1/')