json checks

Author: peff

.github/workflows/main.yml

@@ -21,7 +21,15 @@ concurrency:
 jobs:
   ci-config:
     name: config
-    if: vars.CI_BRANCHES == '' || contains(vars.CI_BRANCHES, github.ref_name)
+    if: |
+      (fromJSON(vars.CI_CONFIG).allow == '' ||
+       contains(fromJSON(vars.CI_CONFIG).allow, github.ref_name)) &&
+      (fromJSON(vars.CI_CONFIG).reject == '' ||
+       !contains(fromJSON(vars.CI_CONFIG).reject, github.ref_name)) &&
+      (fromJSON(vars.CI_CONFIG).allow-prefix == '' ||
+       startsWith(github.ref_name, fromJSON(vars.CI_CONFIG).allow-prefix)) &&
+      (fromJSON(vars.CI_CONFIG).reject-prefix == '' ||
+       !startsWith(github.ref_name, fromJSON(vars.CI_CONFIG).reject-prefix))
     runs-on: ubuntu-latest
     outputs:
       enabled: ${{ steps.check-ref.outputs.enabled }}${{ steps.skip-if-redundant.outputs.enabled }}

ci/config/README

@@ -6,7 +6,9 @@ GitHub web interface. These can be found at:
 
 The following variables can be used:
 
- - CI_BRANCHES
+ - CI_CONFIG
+
+   ...
 
    By default, CI is run when any branch is pushed. If this variable is
    non-empty, then only the branches it lists will run CI. Branch names