Rename image to container

Author: bthomee

.github/workflows/debian.yml

@@ -131,7 +131,7 @@ jobs:
         os: ${{ fromJson(needs.generate-matrix.outputs.os) }}
         build_type: ${{ fromJson(needs.generate-matrix.outputs.build_type) }}
     runs-on: ${{ matrix.architecture.runner }}
-    image: ghcr.io/xrplf/ci/debian-${{ matrix.os.release }}:${{ matrix.os.compiler_name }}-${{ matrix.os.compiler_version }}
+    container: ghcr.io/xrplf/ci/debian-${{ matrix.os.release }}:${{ matrix.os.compiler_name }}-${{ matrix.os.compiler_version }}
     steps:
       - name: Checkout repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683