[openwrt/openwrt] CI: build: package external toolchain after build

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch openwrt-23.05:
https://git.openwrt.org/b98b3d42969742b29d965558262e903e3642be14

commit b98b3d42969742b29d965558262e903e3642be14
Author: Christian Marangi <ansuelsmth at gmail.com>
AuthorDate: Tue Dec 20 20:02:35 2022 +0100

    CI: build: package external toolchain after build
    
    Package external toolchain after correct build.
    
    Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
    (cherry picked from commit ce2e7c52f8ebc7ea92a1436ee2dbeecf149132dc)
---
 .github/workflows/build.yml | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index eba4df7e91..5ca6f4e32e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -47,6 +47,10 @@ on:
           mbedtls
           wolfssl
           openssl
+      build_external_toolchain:
+        type: boolean
+      upload_external_toolchain:
+        type: boolean
 
 permissions:
   contents: read
@@ -368,6 +372,12 @@ jobs:
         working-directory: openwrt
         run: make -j$(nproc) BUILD_LOG=1 || ret=$? .github/workflows/scripts/show_build_failures.sh
 
+      - name: Build external toolchain
+        if: inputs.build_external_toolchain == true
+        shell: su buildbot -c "sh -e {0}"
+        working-directory: openwrt
+        run: make target/toolchain/compile -j$(nproc) BUILD_LOG=1 || ret=$? .github/workflows/scripts/show_build_failures.sh
+
       - name: Coverity prepare toolchain
         if: inputs.coverity_check_packages != ''
         shell: su buildbot -c "sh -e {0}"
@@ -425,3 +435,19 @@ jobs:
         with:
           name: ${{ inputs.target }}-${{ inputs.subtarget }}-logs
           path: "openwrt/logs"
+
+      - name: Find external toolchain name
+        id: get-toolchain-name
+        if: inputs.upload_external_toolchain == true
+        working-directory: openwrt
+        run: |
+          TOOLCHAIN_NAME=$(ls bin/targets/${{inputs.target }}/${{ inputs.subtarget }} | grep toolchain)
+          echo "toolchain-name=$TOOLCHAIN_NAME" >> $GITHUB_OUTPUT
+
+      - name: Upload prebuilt toolchain
+        if: inputs.upload_external_toolchain == true
+        uses: actions/upload-artifact at v3
+        with:
+          name: ${{ inputs.target }}-${{ inputs.subtarget }}-external-toolchain
+          path: openwrt/bin/targets/${{ inputs.target }}/${{ inputs.subtarget }}/${{ steps.get-toolchain-name.outputs.toolchain-name }}
+          retention-days: 1