fix: install workflow runtime dependencies

.forgejo/workflows/register-skill-release.yml

@@ -22,6 +22,13 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Install runtime dependencies
+        shell: bash
+        run: |
+          set -euo pipefail
+          apt-get update
+          apt-get install -y jq curl ca-certificates python3
+
       - name: Load skill doc content
         shell: bash
         run: |
@@ -65,6 +72,7 @@ jobs:
             if [ -f "${SKILL_BASE_DIR}/package.json" ]; then
               PKG_NAME=$(jq -r '.name // empty' "${SKILL_BASE_DIR}/package.json")
               if [ -n "$PKG_NAME" ]; then
+                # Strip npm scope: @scope/skill-name -> skill-name
                 SKILL_SLUG="${PKG_NAME##*/}"
               fi
             fi