ci: update msg (#76)

.github/workflows/build-kernel-5.15.yml

@@ -29,6 +29,7 @@ jobs:
     - uses: actions/checkout@v3
       with:
         path: KernelSU
+        fetch-depth: 0
 
     - name: Setup kernel source
       run: |
@@ -96,7 +97,9 @@ jobs:
         TITLE: kernel-aarch64-${{ matrix.version }}
       run: |
         if [ ! -z "${{ secrets.BOT_TOKEN }}" ]; then
-          export VERSION=$(git describe --tags --always)
+          cd $GITHUB_WORKSPACE/KernelSU
+          export VERSION=$(git rev-list --count HEAD)
+          cd -
           OUTDIR=android-kernel/out/android13-5.15/dist
           BOOT=${{ matrix.version }}-boot.img.zip
           zip $BOOT -j -r $OUTDIR/boot.img