Add support for step.working-directory (closes #149) (#154)

pkg/runner/testdata/workdir/push.yml

@@ -0,0 +1,16 @@
+name: workdir
+on: push
+
+jobs:
+  workdir:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - run: '[[ "$(pwd)" == "/github/workspace/workdir" ]]'
+      working-directory: workdir
+
+  noworkdir:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: '[[ "$(pwd)" == "/github/workspace" ]]'