ci: Shorten container image to container

.github/workflows/ci.yml

@@ -27,8 +27,7 @@ jobs:
   check-code-formatting:
     name: Check code formatting
     runs-on: ubuntu-latest
-    container:
-      image: openrct2/openrct2-build:4-format
+    container: openrct2/openrct2-build:4-format
     steps:
       - name: Checkout
         uses: actions/checkout@v3
@@ -80,8 +79,7 @@ jobs:
     name: Windows (${{ matrix.platform_name }}) using mingw
     runs-on: ubuntu-latest
     needs: check-code-formatting
-    container:
-      image: openrct2/openrct2-build:4-mingw
+    container: openrct2/openrct2-build:4-mingw
     strategy:
       fail-fast: false
       matrix:
@@ -212,8 +210,7 @@ jobs:
     name: Linux (${{ matrix.platform }}, ${{ matrix.distro }}, portable)
     runs-on: ubuntu-latest
     needs: check-code-formatting
-    container:
-      image: ${{ matrix.image }}
+    container: ${{ matrix.image }}
     strategy:
       fail-fast: false
       matrix:
@@ -268,8 +265,7 @@ jobs:
     name: Linux (x64, AppImage)
     runs-on: ubuntu-latest
     needs: check-code-formatting
-    container:
-      image: openrct2/openrct2-build:0.3.1-bionic
+    container: openrct2/openrct2-build:0.3.1-bionic
     steps:
       - name: Checkout
         uses: actions/checkout@v3
@@ -330,8 +326,7 @@ jobs:
     name: Linux (Debug, [http, network, OpenGL] disabled) using clang
     runs-on: ubuntu-latest
     needs: check-code-formatting
-    container:
-      image: openrct2/openrct2-build:0.3.1-bionic
+    container: openrct2/openrct2-build:0.3.1-bionic
     steps:
       - name: Checkout
         uses: actions/checkout@v3
@@ -345,8 +340,7 @@ jobs:
     name: Android
     runs-on: ubuntu-latest
     needs: check-code-formatting
-    container:
-      image: openrct2/openrct2-build:0.3.1-android
+    container: openrct2/openrct2-build:0.3.1-android
     steps:
       - name: Checkout
         uses: actions/checkout@v3