[openwrt/openwrt] CI: build: fix matching for openwrt release branch for toolchain parsing

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch openwrt-21.02:
https://git.openwrt.org/8df40b136a172db2d65745695a60515395339413

commit 8df40b136a172db2d65745695a60515395339413
Author: Christian Marangi <ansuelsmth at gmail.com>
AuthorDate: Sun Dec 4 20:36:11 2022 +0100

    CI: build: fix matching for openwrt release branch for toolchain parsing
    
    The current match logic doesn't handle test for push events related to
    stable release (example openwrt-22.03) but only fork with the related
    prefix (example openwrt-22.03-fixup)
    
    Fix wrong matching and while at it also add extra checks to other
    matching (check if the branch name actually start with the requested
    prefix)
    
    Fixes: e24a1e6f6d7f ("CI: build: add support for external toolchains from stable branch")
    Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
    (cherry picked from commit e3cf2b84e5f8708ca17d931ef60746516c8a2fe4)
---
 .github/workflows/build.yml | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f35a70d8f9..115bf2c654 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -151,16 +151,18 @@ jobs:
           TOOLCHAIN_PATH=snapshots
 
           if [ -n "${{ github.base_ref }}" ]; then
-            if echo "${{ github.base_ref }}" | grep -q -E 'openwrt-[0-9][0-9]\.[0-9][0-9]'; then
-              major_ver="$(echo ${{ github.base_ref }} | sed 's/openwrt-/v/')"
+            if echo "${{ github.base_ref }}" | grep -q -E '^openwrt-[0-9][0-9]\.[0-9][0-9]$'; then
+              major_ver="$(echo ${{ github.base_ref }} | sed 's/^openwrt-/v/')"
             fi
           elif [ "${{ github.ref_type }}" = "branch" ]; then
-            if echo "${{ github.ref_name }}" | grep -q -E 'openwrt-[0-9][0-9]\.[0-9][0-9]-'; then
-              major_ver="$(echo ${{ github.ref_name }} | sed 's/openwrt-\([0-9][0-9]\.[0-9][0-9]\)-.*/v\1/')"
+            if echo "${{ github.ref_name }}" | grep -q -E '^openwrt-[0-9][0-9]\.[0-9][0-9]$'; then
+              major_ver="$(echo ${{ github.ref_name }} | sed 's/^openwrt-/v/')"
+            elif echo "${{ github.ref_name }}" | grep -q -E '^openwrt-[0-9][0-9]\.[0-9][0-9]-'; then
+              major_ver="$(echo ${{ github.ref_name }} | sed 's/^openwrt-\([0-9][0-9]\.[0-9][0-9]\)-.*/v\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
-              major_ver="$(sed 's/\(v[0-9][0-9]\.[0-9][0-9]\)\..\+/\1/')"
+            if echo "${{ github.ref_name }}" | grep -q -E '^v[0-9][0-9]\.[0-9][0-9]\..+'; then
+              major_ver="$(echo ${{ github.ref_name }} | sed 's/^\(v[0-9][0-9]\.[0-9][0-9]\)\..\+/\1/')"
             fi
           fi