fix: preserve job result state in case of failure (#1519)

* fix: preserve job result state in case of failure

There is just one job field for the job result. This is also true for
matrix jobs. We need to preserve the failure state of a job to
have the whole job failing in case of one permuation of the matrix failed.

Closes #1518

* test: remove continue-on-error on job level

This feature is not yet supported by act and if implemented
would make this test invalid

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

pkg/runner/testdata/matrix-exitcode/push.yml

@@ -0,0 +1,16 @@
+name: test
+
+on: push
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        val: ["success", "failure"]
+      fail-fast: false
+    steps:
+      - name: test
+        run: |
+          echo "Expected job result: ${{ matrix.val }}"
+          [[ "${{ matrix.val }}" = "success" ]] || exit 1