fix: set container image in workflow files

.github/workflows/container-scan.yml

@@ -8,6 +8,8 @@ jobs:
   container-scan:
     name: Container Scan
     runs-on: docker
+    container:
+      image: ghcr.io/di0ik/forgejo_runner_container:main
     steps:
       - name: Checkout code
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4

.github/workflows/docker-build.yml

@@ -12,6 +12,8 @@ on:
 jobs:
   docker:
     runs-on: docker
+    container:
+      image: ghcr.io/di0ik/forgejo_runner_container:main
     steps:
       - name: Login to Docker Hub
         uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772 # v3