feat: load every environment from --env-file to workflow (#184)

* feat: load every environment from --env-file to workflow

* fix: pass dotenv's environments through by context

* updates to support --secret-file

Co-authored-by: Casey Lee <cplee@nektos.com>

pkg/runner/testdata/secrets/push.yml

@@ -11,3 +11,7 @@ jobs:
           echo "${{secrets.MULTILINE_SECRET}}" | wc -l | grep 3
       - run: |
           echo '${{secrets.JSON_SECRET}}' | grep "{\"foo\": \"bar\"}"
+      - run: |
+          echo '${{env.HELLO}}' | grep "WORLD"
+      - run: |
+          echo "${{env.MULTILINE_ENV}}" | wc -l | grep 3