build: gha: actions/checkout: don't clean working copy & fetch full history from git

- instead of cleaning the whole working copy, clean out just the `out` and `dist` dirs
- this allows the `cache/` dir to survive on-disk on self-hosted runners
- bonus: using `fetch-depth: 0` allows for much faster `git fetch` times on self-hosted runners over time
- this is done only for the jobs that can run in self-hosted runners (not prep/release jobs)

Signed-off-by: Ricardo Pardini <ricardo@pardini.net>

Author: rpardini

.github/workflows/build-all-matrix.yaml

@@ -66,6 +66,10 @@ jobs:
     steps:
       - name: Checkout build repo
         uses: actions/checkout@v4
+        with: { clean: false, fetch-depth: 0 }
+
+      - name: Cleanup directories
+        run: rm -rf out dist # Since we've clean:false in actions/checkout above, ensure we start fresh, still, preserve cache/ dir on self-hosted runners
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
@@ -100,6 +104,10 @@ jobs:
     steps:
       - name: Checkout build repo
         uses: actions/checkout@v4
+        with: { clean: false, fetch-depth: 0 }
+
+      - name: Cleanup directories
+        run: rm -rf out dist # Since we've clean:false in actions/checkout above, ensure we start fresh, still, preserve cache/ dir on self-hosted runners
 
       - name: Set up Docker Buildx # nb: no need for qemu here, kernels are cross-compiled, instead of the compilation being emulated
         uses: docker/setup-buildx-action@v3
@@ -130,6 +138,10 @@ jobs:
     steps:
       - name: Checkout build repo
         uses: actions/checkout@v4
+        with: { clean: false, fetch-depth: 0 }
+
+      - name: Cleanup directories
+        run: rm -rf out dist # Since we've clean:false in actions/checkout above, ensure we start fresh, still, preserve cache/ dir on self-hosted runners
 
       - name: Set up Docker Buildx # nb: no need for qemu here, kernels are cross-compiled, instead of the compilation being emulated
         uses: docker/setup-buildx-action@v3