setup(workflow): CI run test only on changed workspace(s)

Author: JakobJingleheimer

.github/workflows/ci.yml

@@ -62,11 +62,10 @@ jobs:
 
   lint-and-types:
     name: Lint & types
+    runs-on: ubuntu-slim
 
     if: ${{ github.event_name != 'pull_request' || !github.event.pull_request.draft }}
 
-    runs-on: ubuntu-slim
-
     steps:
       # FIXME https://github.com/step-security/harden-runner/issues/627
       # - name: Harden the runner (Audit all outbound calls)
@@ -85,11 +84,10 @@ jobs:
 
   test:
     name: Codemod JSSG tests
+    runs-on: ${{ matrix.os }}
 
     if: ${{ github.event_name != 'pull_request' || !github.event.pull_request.draft }}
 
-    runs-on: ${{ matrix.os }}
-
     strategy:
       fail-fast: false
       matrix:
@@ -117,4 +115,12 @@ jobs:
           node-version-file: ".nvmrc"
 
       - run: npm ci
-      - run: node --run test
+
+      - run: >
+          npm run test $(
+            git diff --name-only ${{ github.event.pull_request.base.sha }} ${{ github.sha }}
+            | grep '^recipes/'
+            | cut -d/ -f1,2
+            | sort -u
+            | sed 's/^/--workspace=/'
+          )