Switch ware-alpine to not_branches, add musl tag

Author: zware

master/custom/builders.py

@@ -394,7 +394,6 @@ def get_builder_tier(builder: str) -> str:
 # Match builder name (excluding the branch name) of builders that should only
 # run on the main and PR branches.
 ONLY_MAIN_BRANCH = (
-    "Alpine Linux",
     "ARM64 Windows",
     "Windows PGO",
     "AMD64 Arch Linux Perf",

master/custom/workers.py

@@ -218,8 +218,9 @@ def get_workers(settings):
         ),
         cpw(
             name="ware-alpine",
-            tags=['linux', 'unix', 'alpine', 'docker', 'amd64', 'x86-64'],
-            branches=[MAIN_BRANCH_NAME],
+            tags=['linux', 'unix', 'alpine', 'docker', 'amd64', 'x86-64', 'musl'],
+            # 3.15 is the first version to pass all tests
+            not_branches=['3.9', '3.10', '3.11', '3.12', '3.13', '3.14'],
         ),
         cpw(
             name="ware-freebsd",