[openwrt/openwrt] CI: build: fallback to compile toolchain if external toolchain fail

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/895f38ca1efeb46f0cd3029c732e6156d4589eb0

commit 895f38ca1efeb46f0cd3029c732e6156d4589eb0
Author: Christian Marangi <ansuelsmth at gmail.com>
AuthorDate: Tue Jan 10 23:51:32 2023 +0100

    CI: build: fallback to compile toolchain if external toolchain fail
    
    If for whatever reason external toolchain can't be found or downloaded,
    fallback to internal toolchain build.
    
    This can be useful when new target are introduced and external toolchain
    are not present in openwrt fileserver.
    
    Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
---
 .github/workflows/build.yml | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c892857999..de168c0cb9 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -189,6 +189,8 @@ jobs:
             TOOLCHAIN_SHA256=$(echo "$TOOLCHAIN_STRING" | cut -d ' ' -f 1)
 
             echo "toolchain-type=external_sdk" >> $GITHUB_OUTPUT
+          else
+            echo "toolchain-type=internal" >> $GITHUB_OUTPUT
           fi
 
           echo "TOOLCHAIN_FILE=$TOOLCHAIN_FILE" >> "$GITHUB_ENV"
@@ -196,7 +198,7 @@ jobs:
           echo "TOOLCHAIN_PATH=$TOOLCHAIN_PATH" >> "$GITHUB_ENV"
 
       - name: Cache external toolchain/sdk
-        if: inputs.build_toolchain == false
+        if: inputs.build_toolchain == false && steps.parse-toolchain.outputs.toolchain-type != 'internal'
         id: cache-external-toolchain
         uses: actions/cache at v3
         with:
@@ -212,7 +214,7 @@ jobs:
             ccache-kernel-${{ env.TARGET }}/${{ env.SUBTARGET }}-
 
       - name: Download external toolchain/sdk
-        if: inputs.build_toolchain == false && steps.cache-external-toolchain.outputs.cache-hit != 'true'
+        if: inputs.build_toolchain == false && steps.cache-external-toolchain.outputs.cache-hit != 'true' && steps.parse-toolchain.outputs.toolchain-type != 'internal'
         shell: su buildbot -c "sh -e {0}"
         working-directory: openwrt
         run: |
@@ -311,7 +313,7 @@ jobs:
             --config ${{ env.TARGET }}/${{ env.SUBTARGET }}
 
       - name: Configure internal toolchain
-        if: inputs.build_toolchain == true
+        if: inputs.build_toolchain == true || steps.parse-toolchain.outputs.toolchain-type == 'internal'
         shell: su buildbot -c "sh -e {0}"
         working-directory: openwrt
         run: |