Add ccache log support

Author: luigimak

.github/workflows/build-kernel-release.yml

@@ -486,6 +486,7 @@ jobs:
           if command -v ccache >/dev/null 2>&1; then
             CACHE_DIR="${{ github.workspace }}/.ccache"
             LDCACHE_DIR="${{ github.workspace }}/.ld_cache"
+            CCACHE_LOG="${{ github.workspace }}/ccache.log"
             mkdir -p "$CACHE_DIR"
             mkdir -p "$LDCACHE_DIR"
 
@@ -511,7 +512,12 @@ jobs:
               export "$setting"
               echo "$setting" >> "$GITHUB_ENV"
             done
-            
+
+            if [ "${{ inputs.debug }}" == "true" ]; then
+              export "CCACHE_LOGFILE=$CCACHE_LOG"
+              echo "CCACHE_LOGFILE=$CCACHE_LOG" >> "$GITHUB_ENV"
+            fi
+
             if ccache --help 2>&1 | grep -q 'depend_mode'; then
               export CCACHE_DEPEND=true
               echo "CCACHE_DEPEND=true" >> "$GITHUB_ENV"