CI: migrate each workflow to use reusable workflow from dedicated repo

Migrate each workflow to use reusable workflow from dedicated repo to
skip pushing CI related commits to openwrt and better track versioning
of CI workflow.

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

.github/workflows/label-target.yml

@@ -7,36 +7,10 @@ on:
       - labeled
 
 jobs:
-  set_target:
-    if: startsWith(github.event.label.name, 'ci:target:')
-    name: Set target
-    runs-on: ubuntu-latest
-    outputs:
-      target: ${{ steps.set_target.outputs.target }}
-      subtarget: ${{ steps.set_target.outputs.subtarget }}
-
-    steps:
-      - name: Set target
-        id: set_target
-        env:
-          CI_EVENT_LABEL_NAME: ${{ github.event.label.name }}
-        run: |
-          echo "$CI_EVENT_LABEL_NAME" | sed -n 's/.*:\(.*\):\(.*\)$/target=\1/p' | tee --append $GITHUB_OUTPUT
-          echo "$CI_EVENT_LABEL_NAME" | sed -n 's/.*:\(.*\):\(.*\)$/subtarget=\2/p' | tee --append $GITHUB_OUTPUT
-
-  build_target:
-    name: Build target
-    needs: set_target
+  build-target-label:
+    name: Build target from defined label
     permissions:
       contents: read
       packages: read
       actions: write
-    uses: ./.github/workflows/build.yml
-    with:
-      container_name: toolchain
-      target: ${{ needs.set_target.outputs.target }}
-      subtarget: ${{ needs.set_target.outputs.subtarget }}
-      build_full: true
-      build_all_kmods: true
-      build_all_boards: true
-      build_all_modules: true
+    uses: openwrt/actions-shared-workflows/.github/workflows/label-target.yml@main