ci: add stable aggregate checks

Author: glitchedmob

.github/workflows/actionlint.yml

@@ -2,11 +2,6 @@ name: CI
 
 on:
   pull_request:
-    paths:
-      - SgfDevs/**
-      - SgfDevs.Tests/**
-      - SgfDevs.slnx
-      - .github/workflows/**
   push:
     branches:
       - main
@@ -20,7 +15,30 @@ permissions:
   contents: read
 
 jobs:
+  changes:
+    runs-on: ubuntu-latest
+    outputs:
+      application: ${{ steps.changed-files.outputs.application_any_changed }}
+      workflows: ${{ steps.changed-files.outputs.workflows_any_changed }}
+    steps:
+      - uses: actions/checkout@v7
+
+      - name: Detect relevant changes
+        id: changed-files
+        uses: tj-actions/changed-files@v47
+        with:
+          files_yaml: |
+            application:
+              - SgfDevs/**
+              - SgfDevs.Tests/**
+              - SgfDevs.slnx
+              - .github/workflows/ci.yml
+            workflows:
+              - .github/workflows/**
+
   build-and-test:
+    needs: changes
+    if: ${{ needs.changes.outputs.application == 'true' }}
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v7
@@ -37,3 +55,25 @@ jobs:
 
       - name: Test
         run: dotnet test SgfDevs.slnx --no-build --verbosity minimal
+
+  actionlint:
+    needs: changes
+    if: ${{ needs.changes.outputs.workflows == 'true' }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+      - uses: raven-actions/actionlint@v2
+
+  result:
+    name: CI checks
+    if: ${{ always() && github.event_name == 'pull_request' }}
+    needs:
+      - changes
+      - build-and-test
+      - actionlint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: re-actors/alls-green@05ac9388f0aebcb5727afa17fcccfecd6f8ec5fe # release/v1
+        with:
+          allowed-skips: build-and-test, actionlint
+          jobs: ${{ toJSON(needs) }}