BUILD-9108 fix build-gradle for Windows

use /bin/usr/find in build-gradle for compatibility with Windows Bash
use local cache action in build-gradle

Author: julien-carsique-sonarsource

build-gradle/action.yml

@@ -80,6 +80,7 @@ runs:
         mkdir -p ".actions"
         ln -sf "$host_actions_root/get-build-number" .actions/get-build-number
         ln -sf "$host_actions_root/shared" .actions/shared
+        ln -sf "$host_actions_root/cache" .actions/cache
         ls -la .actions/*
         echo "::endgroup::"
 
@@ -130,20 +131,16 @@ runs:
       if: ${{ inputs.disable-caching != 'true' }}
       shell: bash
       run: |
-        # Generate cache key from all Gradle files
-        find . \( -name '*.gradle' -o -name '*.gradle.kts' \) -type f -exec md5sum {} \; | sort > gradle-md5-sums.txt
-        md5sum gradle/libs.versions.toml gradle/wrapper/gradle-wrapper.properties 2>/dev/null >> gradle-md5-sums.txt || true
-
-        GRADLE_CACHE_KEY=$(md5sum gradle-md5-sums.txt | awk '{ print $1 }')
-
+        gradle-md5-sums="$(mktemp)"
+        /usr/bin/find . \( -name '*.gradle' -o -name '*.gradle.kts' \) -type f -exec md5sum {} \; > "$gradle-md5-sums"
+        md5sum gradle/libs.versions.toml gradle/wrapper/gradle-wrapper.properties 2>/dev/null >> "$gradle-md5-sums" || true
+        GRADLE_CACHE_KEY=$(md5sum "$gradle-md5-sums" | awk '{ print $1 }')
         echo "🔑 Generated cache key: ${GRADLE_CACHE_KEY}"
         echo "GRADLE_CACHE_KEY=${GRADLE_CACHE_KEY}" >> "$GITHUB_ENV"
 
-        rm -f gradle-md5-sums.txt
-
     - name: Restore Gradle Cache
       if: ${{ inputs.disable-caching != 'true' }}
-      uses: SonarSource/gh-action_cache@v1
+      uses: ./.actions/cache
       id: gradle-cache-restore
       with:
         path: ${{ inputs.cache-paths }}

promote/promote.sh

@@ -44,7 +44,7 @@ MULTI_REPO_SRC_PRIVATE=sonarsource-private-qa
 MULTI_REPO_SRC_PUBLIC=sonarsource-public-qa
 
 set_build_env() {
-  DEFAULT_BRANCH=${DEFAULT_BRANCH:=$(gh repo view --json defaultBranchRef --jq ".defaultBranchRef.name")}
+  : "${DEFAULT_BRANCH:=$(gh repo view --json defaultBranchRef --jq ".defaultBranchRef.name")}"
   export DEFAULT_BRANCH
 }