CI: tools: reogranize and split workflow

Generilize tools workflow for future usage in shared workflow for tools
build.

Split tools workflow to tools and push-containers:
- tools just execute build test
- push-containers build and push prebuilt containers

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

.github/workflows/build-tools.yml

@@ -0,0 +1,72 @@
+name: Build host tools
+
+on:
+  workflow_call:
+    inputs:
+      generate_prebuilt_artifacts:
+        type: boolean
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    name: Build tools
+    runs-on: ubuntu-latest
+    container: registry.gitlab.com/openwrt/buildbot/buildworker-3.4.1
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          path: openwrt
+
+      - name: Fix permission
+        run: chown -R buildbot:buildbot openwrt
+
+      - name: Set configs for tools container
+        shell: su buildbot -c "sh -e {0}"
+        working-directory: openwrt
+        run: |
+          touch .config
+          echo CONFIG_DEVEL=y >> .config
+          echo CONFIG_AUTOREMOVE=y >> .config
+          echo CONFIG_CCACHE=y >> .config
+
+      - name: Make prereq
+        shell: su buildbot -c "sh -e {0}"
+        working-directory: openwrt
+        run: make defconfig
+
+      - name: Build tools
+        shell: su buildbot -c "sh -e {0}"
+        working-directory: openwrt
+        run: make tools/install -j$(nproc) BUILD_LOG=1 || ret=$? .github/workflows/scripts/show_build_failures.sh
+
+      - name: Upload logs
+        if: always()
+        uses: actions/upload-artifact@v3
+        with:
+          name: linux-buildbot-logs
+          path: openwrt/logs
+
+      - name: Upload config
+        if: always()
+        uses: actions/upload-artifact@v3
+        with:
+          name: linux-buildbot-config
+          path: openwrt/.config
+
+      - name: Archive prebuilt tools
+        if: inputs.generate_prebuilt_artifacts == true
+        shell: su buildbot -c "sh -e {0}"
+        working-directory: openwrt
+        run: tar --mtime=now -cf tools.tar staging_dir/host build_dir/host dl
+
+      - name: Upload prebuilt tools
+        if: inputs.generate_prebuilt_artifacts == true
+        uses: actions/upload-artifact@v3
+        with:
+          name: linux-buildbot-prebuilt-tools
+          path: openwrt/tools.tar
+          retention-days: 1