allow expected failures

Author: keewis

.github/workflows/ci.yml

@@ -41,6 +41,10 @@ jobs:
           - ["envs/env1.yaml"]
           - ["envs/env2.yaml"]
           - ["envs/env1.yaml", "envs/env2.yaml"]
+        expected-failure: false
+        include:
+          - env-paths: ["envs/failing-env1.yaml"]
+            expected-failure: true
 
     steps:
       - name: clone the repository
@@ -49,3 +53,12 @@ jobs:
         uses: ./
         with:
           environment-paths: "${{ toJSON(matrix.env-paths) }}"
+      - name: evaluate failures
+        if: |
+          always()
+          && (
+            (failure() && ! ${{ matrix.expected-failure }})
+            || (success() && ${{ matrix.expected-failure }})
+          )
+        shell: bash -l {0}
+        run: exit 1