Add ubuntu-slim runner support for lightweight workflows

.github/workflows/check-expected-release-files.yml

@@ -15,7 +15,7 @@ defaults:
 
 jobs:
   check-expected-release-files:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
 
     permissions:
       contents: read

.github/workflows/label-pr-size.yml

@@ -16,7 +16,7 @@ permissions:
 jobs:
   sizeup:
     name: Label PR with size
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
 
     steps:
       - name: Run sizeup

pr-checks/checks/cleanup-db-cluster-dir.yml

@@ -1,6 +1,7 @@
 name: "Clean up database cluster directory"
 description: "The database cluster directory is cleaned up if it is not empty."
 versions: ["linked"]
+runnerSize: "slim"
 steps:
   - name: Add a file to the database cluster directory
     run: |

pr-checks/checks/config-input.yml

@@ -2,6 +2,7 @@ name: "Config input"
 description: "Tests specifying configuration using the config input"
 installNode: true
 versions: ["linked"]
+runnerSize: "slim"
 steps:
   - name: Copy queries into workspace
     run: |

pr-checks/checks/language-aliases.yml

@@ -1,6 +1,7 @@
 name: "Language aliases"
 description: "Tests that language aliases are resolved correctly"
 versions: ["linked"]
+runnerSize: "slim"
 steps:
   - uses: ./../action/init
     with:

pr-checks/sync.py

@@ -76,17 +76,23 @@ def writeHeader(checkStream):
         if version == "latest":
             raise ValueError('Did not recognize "version: latest". Did you mean "version: linked"?')
 
-        runnerImages = ["ubuntu-latest", "macos-latest", "windows-latest"]
+        # Determine runner size
+        # "default" is used in check specifications and maps to "latest" for the actual runner image
+        runnerSize = checkSpecification.get('runnerSize', 'default')
+        if runnerSize == 'default':
+            runnerSize = 'latest'
+
+        # Build runner images based on runner size and operating systems
         operatingSystems = checkSpecification.get('operatingSystems', ["ubuntu"])
-
+        
         for operatingSystem in operatingSystems:
-            runnerImagesForOs = [image for image in runnerImages if image.startswith(operatingSystem)]
-
-            for runnerImage in runnerImagesForOs:
-                matrix.append({
-                    'os': runnerImage,
-                    'version': version
-                })
+            # Construct the runner image name: {os}-{size}
+            # Note: Not all OS types may support all runner sizes (e.g., only ubuntu-slim exists as of now)
+            runnerImage = f"{operatingSystem}-{runnerSize}"
+            matrix.append({
+                'os': runnerImage,
+                'version': version
+            })
 
         useAllPlatformBundle = "false" # Default to false
         if checkSpecification.get('useAllPlatformBundle'):