Fix hashFiles glob patterns in workflow

Changes:
- Split invalid '**/*.gradle*' into explicit '**/*.gradle' and '**/*.gradle.kts'
- Changed 'gradle.properties' to '**/gradle.properties' to catch all instances
- Fixed buildSrc path from '**/buildSrc/**/*.kt' to 'apps/buildSrc/src/**/*.kt'

All patterns now match actual files in the repository:
- 24 .gradle files
- 8 .gradle.kts files
- 2 gradle-wrapper.properties files
- 3 gradle.properties files
- 4 Kotlin files in apps/buildSrc/src/

This resolves the hashFiles parsing error in GitHub Actions.

Author: hermannakos

.github/workflows/pr-pipeline.yml

@@ -99,7 +99,7 @@ jobs:
           path: |
             ~/.gradle/caches
             ~/.gradle/wrapper
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties', 'gradle.properties', '**/buildSrc/**') }}
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle', '**/*.gradle.kts', '**/gradle-wrapper.properties', '**/gradle.properties', 'apps/buildSrc/src/**/*.kt') }}
           restore-keys: |
             ${{ runner.os }}-gradle-
 
@@ -258,7 +258,7 @@ jobs:
           path: |
             ~/.gradle/caches
             ~/.gradle/wrapper
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties', 'gradle.properties', '**/buildSrc/**') }}
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle', '**/*.gradle.kts', '**/gradle-wrapper.properties', '**/gradle.properties', 'apps/buildSrc/src/**/*.kt') }}
           restore-keys: |
             ${{ runner.os }}-gradle-
 
@@ -349,7 +349,7 @@ jobs:
           path: |
             ~/.gradle/caches
             ~/.gradle/wrapper
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties', 'gradle.properties', '**/buildSrc/**') }}
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle', '**/*.gradle.kts', '**/gradle-wrapper.properties', '**/gradle.properties', 'apps/buildSrc/src/**/*.kt') }}
           restore-keys: |
             ${{ runner.os }}-gradle-