ci(fuzzing): migrate to RunsOn with ccache and bump container

Migrate the fuzzing workflow from GitHub-hosted ubuntu-latest to
RunsOn 4cpu with s3-cache. Bump the container from the stale
px4io/px4-dev:v1.16.0-rc2 to ghcr.io/px4/px4-dev:v1.17.0-rc2.

Wire setup-ccache / save-ccache with cache-key-prefix ccache-sitl
and max-size 300M, sharing the SITL build cache with checks:tests.
Both build px4_sitl_test/px4_sitl_default so the ccache contents
overlap significantly.

Drop the manual apt install clang step since the v1.17.0-rc2
container already ships clang. Replace the git config --global
safe.directory workaround with --system to match the repo convention.
Add runs-on/action@v2 for the S3 cache proxy. Add fetch-depth: 1
since the fuzzer doesn't need git history.

Signed-off-by: Ramon Roche <mrpollo@gmail.com>

.github/workflows/fuzzing.yml

@@ -12,19 +12,24 @@ env:
 
 jobs:
   Fuzzing:
-    runs-on: ubuntu-latest
+    runs-on: [runs-on,runner=4cpu-linux-x64,image=ubuntu24-full-x64,"run-id=${{ github.run_id }}",spot=false,extras=s3-cache]
     container:
-      image: px4io/px4-dev:v1.16.0-rc2-4-gb67c65bfe6
+      image: ghcr.io/px4/px4-dev:v1.17.0-rc2
     steps:
-      - name: Install Dependencies
-        run: |
-          apt update && apt install -y clang
-
-      - name: Fix git in Container
-        run: |
-          git config --global --add safe.directory $(realpath .)
+      - uses: runs-on/action@v2
 
       - uses: actions/checkout@v6
+        with:
+          fetch-depth: 1
+
+      - name: Configure Git Safe Directory
+        run: git config --system --add safe.directory '*'
+
+      - uses: ./.github/actions/setup-ccache
+        id: ccache
+        with:
+          cache-key-prefix: ccache-sitl
+          max-size: 300M
 
       - name: Build and Run Fuzz Tests
         run: |
@@ -38,7 +43,11 @@ jobs:
             ./Tools/ci/run_fuzz_tests.sh $fuzz_binary 15m
           done
 
-      # Create a github issue in case of a failure
+      - uses: ./.github/actions/save-ccache
+        if: always()
+        with:
+          cache-primary-key: ${{ steps.ccache.outputs.cache-primary-key }}
+
       - name: Create Issue
         if: ${{ failure() }}
         uses: JasonEtco/create-an-issue@v2