CI: build: add support for per branch tools container

Add support in build shared workflow for per branch tools container.

With pr the target branch is parsed and the right container is used.

To use the stable container for local testing the branch needs to have
the prefix openwrt-[0-9][0-9].[0-9][0-9]- (example openwrt-21.02-fixup)

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

.github/workflows/build.yml

@@ -31,6 +31,7 @@ jobs:
     outputs:
       owner_lc: ${{ steps.lower_owner.outputs.owner_lc }}
       ccache_hash: ${{ steps.ccache_hash.outputs.ccache_hash }}
+      container_tag: ${{ steps.determine_tools_container.outputs.container_tag }}
 
     steps:
       - name: Checkout
@@ -50,12 +51,38 @@ jobs:
            | md5sum | awk '{ print $1 }')
           echo "ccache_hash=$CCACHE_HASH" >> $GITHUB_OUTPUT
 
+      # Per branch tools container tag
+      # By default stick to latest
+      # For official test targetting openwrt stable branch
+      # Get the branch or parse the tag and push dedicated tools containers
+      # For local test to use the correct container for stable release testing
+      # you need to use for the branch name a prefix of openwrt-[0-9][0-9].[0-9][0-9]-
+      - name: Determine tools container tag
+        id: determine_tools_container
+        run: |
+          CONTAINER_TAG=latest
+          if [ -n "${{ github.base_ref }}" ]; then
+            if echo "${{ github.base_ref }}" | grep -q -E 'openwrt-[0-9][0-9]\.[0-9][0-9]'; then
+              CONTAINER_TAG="${{ github.base_ref }}"
+            fi
+          elif [ ${{ github.ref_type }} == "branch" ]; then
+            if echo "${{ github.ref_name }}" | grep -q -E 'openwrt-[0-9][0-9]\.[0-9][0-9]-'; then
+              CONTAINER_TAG="$(echo ${{ github.ref_name }} | sed 's/^\(openwrt-[0-9][0-9]\.[0-9][0-9]\)-.*/\1/')"
+            fi
+          elif [ ${{ github.ref_type }} == "tag" ]; then
+            if echo "${{ github.ref_name }}" | grep -q -E 'v[0-9][0-9]\.[0-9][0-9]\..+'; then
+              CONTAINER_TAG=openwrt-"$(echo ${{ github.ref_name }} | sed 's/v\([0-9][0-9]\.[0-9][0-9]\)\..\+/\1/')"
+            fi
+          fi
+          echo "Tools container to use tools:$CONTAINER_TAG"
+          echo "container_tag=$CONTAINER_TAG" >> $GITHUB_OUTPUT
+
   build:
     name: Build with external toolchain
     needs: setup_build
     runs-on: ubuntu-latest
 
-    container: ghcr.io/${{ needs.setup_build.outputs.owner_lc }}/tools:latest
+    container: ghcr.io/${{ needs.setup_build.outputs.owner_lc }}/tools:${{ needs.setup_build.outputs.container_tag }}
 
     permissions:
       contents: read

.github/workflows/check-kernel-patches.yml

@@ -18,6 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       owner_lc: ${{ steps.lower_owner.outputs.owner_lc }}
+      container_tag: ${{ steps.determine_tools_container.outputs.container_tag }}
 
     steps:
       - name: Set lower case owner name
@@ -27,12 +28,38 @@ jobs:
             | tr '[:upper:]' '[:lower:]')
           echo "owner_lc=$OWNER_LC" >> $GITHUB_OUTPUT
 
+      # Per branch tools container tag
+      # By default stick to latest
+      # For official test targetting openwrt stable branch
+      # Get the branch or parse the tag and push dedicated tools containers
+      # For local test to use the correct container for stable release testing
+      # you need to use for the branch name a prefix of openwrt-[0-9][0-9].[0-9][0-9]-
+      - name: Determine tools container tag
+        id: determine_tools_container
+        run: |
+          CONTAINER_TAG=latest
+          if [ -n "${{ github.base_ref }}" ]; then
+            if echo "${{ github.base_ref }}" | grep -q -E 'openwrt-[0-9][0-9]\.[0-9][0-9]'; then
+              CONTAINER_TAG="${{ github.base_ref }}"
+            fi
+          elif [ ${{ github.ref_type }} == "branch" ]; then
+            if echo "${{ github.ref_name }}" | grep -q -E 'openwrt-[0-9][0-9]\.[0-9][0-9]-'; then
+              CONTAINER_TAG="$(echo ${{ github.ref_name }} | sed 's/^\(openwrt-[0-9][0-9]\.[0-9][0-9]\)-.*/\1/')"
+            fi
+          elif [ ${{ github.ref_type }} == "tag" ]; then
+            if echo "${{ github.ref_name }}" | grep -q -E 'v[0-9][0-9]\.[0-9][0-9]\..+'; then
+              CONTAINER_TAG=openwrt-"$(echo ${{ github.ref_name }} | sed 's/v\([0-9][0-9]\.[0-9][0-9]\)\..\+/\1/')"
+            fi
+          fi
+          echo "Tools container to use tools:$CONTAINER_TAG"
+          echo "container_tag=$CONTAINER_TAG" >> $GITHUB_OUTPUT
+
   check-patch:
     name: Check Kernel patches
     needs: setup_build
     runs-on: ubuntu-latest
 
-    container: ghcr.io/${{ needs.setup_build.outputs.owner_lc }}/tools:latest
+    container: ghcr.io/${{ needs.setup_build.outputs.owner_lc }}/tools:${{ needs.setup_build.outputs.container_tag }}
 
     permissions:
       contents: read