Explicitly setup a kotlin version

Change the `prepare-test` action to conditionally setup kotlin.

.github/actions/prepare-test/action.yml

@@ -58,3 +58,7 @@ runs:
           echo "::error::Unrecognized version specified!"
           exit 1
         fi
+
+    - uses: fwilhe2/setup-kotlin@fa932efcc943c56bfd69ddace2e61129eb495d58
+      with:
+        version: 1.7.21

pr-checks/sync.py

@@ -80,7 +80,10 @@ def writeHeader(checkStream):
             'uses': './.github/actions/prepare-test',
             'with': {
                 'version': '${{ matrix.version }}',
-                'use-all-platform-bundle': useAllPlatformBundle
+                'use-all-platform-bundle': useAllPlatformBundle,
+                # If the action is being run from a container, then do not setup kotlin.
+                # This is because the kotlin binaries cannot be downloaded from the container.
+                'setup-kotlin': not 'container' in checkSpecification,
             }
         },
         # We don't support Swift on Windows or prior versions of the CLI.