add tests for actions/checkout

.forgejo/workflows/integration.yml

@@ -17,10 +17,10 @@ jobs:
             tests: "cron"
           - version: "1.21.0-1-rc0"
             image: codeberg.org/forgejo-experimental/forgejo
-            tests: "${{ vars.V121_TESTS || 'echo pull-request container expression local-action docker-action if if-fail' }}"
+            tests: "${{ vars.V121_TESTS || 'echo checkout pull-request container expression local-action docker-action if if-fail' }}"
           - version: "1.20"
             image: codeberg.org/forgejo/forgejo
-            tests: "${{ vars.V120_TESTS || 'echo service container expression local-action docker-action if if-fail' }}"
+            tests: "${{ vars.V120_TESTS || 'echo checkout service container expression local-action docker-action if if-fail' }}"
     steps:
       - uses: actions/checkout@v3
       - if: matrix.info.tests != 'none'

testdata/example-checkout/.forgejo/workflows/v3.yml

@@ -0,0 +1,8 @@
+on: [push]
+jobs:
+  ls:
+    runs-on: docker
+    steps:
+      - uses: actions/checkout@v3
+      - run: |
+          ls ${{ github.workspace }}

testdata/example-checkout/.forgejo/workflows/v4.yml

@@ -0,0 +1,8 @@
+on: [push]
+jobs:
+  ls:
+    runs-on: docker
+    steps:
+      - uses: actions/checkout@v4
+      - run: |
+          ls ${{ github.workspace }}