ci: avoid ccache key conflict (#397)

.github/workflows/gki-kernel.yml

@@ -64,7 +64,6 @@ jobs:
     env:
       CCACHE_COMPILERCHECK: "%compiler% -dumpmachine; %compiler% -dumpversion"
       CCACHE_NOHASHDIR: "true"
-      CCACHE_MAXSIZE: "2G"
       CCACHE_HARDLINK: "true"
     steps:
       - uses: actions/checkout@v3
@@ -72,13 +71,6 @@ jobs:
           path: KernelSU
           fetch-depth: 0
 
-      - uses: hendrikmuhs/ccache-action@v1.2
-        if: inputs.use_cache == true
-        with:
-          key: ccache-aarch64-${{ inputs.version_name }}
-          append-timestamp: false
-          save: ${{ github.event_name != 'pull_request' }}
-
       - name: Setup need_upload
         id: need_upload
         run: |
@@ -124,6 +116,14 @@ jobs:
           echo "[+] Add KernelSU symbols"
           cat $KSU_ROOT/kernel/export_symbol.txt | awk '{sub("[ \t]+","");print "  "$0}' >> $SYMBOL_LIST
 
+      - name: Settup ccache
+        if: inputs.use_cache == true
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: gki-kernel-aarch64-${{ inputs.version_name }}
+          max-size: 2G
+          save: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
+
       - name: Build boot.img
         working-directory: android-kernel
         run: CCACHE="/usr/bin/ccache" LTO=thin BUILD_CONFIG=common/build.config.gki.aarch64 build/build.sh