chore: make workspace writable

as used in isc-codetidy, which has working codecov right now.

.github/workflows/main.yml

@@ -63,6 +63,7 @@ jobs:
  run: |
  echo "zpm \"install testcoverage\":1:1" > install-testcoverage
  docker exec --interactive $instance iris session $instance -B < install-testcoverage
+ chmod 777 $GITHUB_WORKSPACE
  
  - name: Build and Test
  run: |
@@ -73,10 +74,12 @@ jobs:
  # Run tests
  echo "zpm \"$package test -only $test_flags\":1:1" >> test.script
  docker exec --interactive $instance iris session $instance -B < build.script && docker exec --interactive $instance iris session $instance -B < test.script
+ 
  - name: Upload coverage reports to Codecov with GitHub Action
  uses: codecov/[email protected]
  env:
  CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+
  - name: Produce CE Artifact
  run: |
  echo "set version=##class(%ZPM.PackageManager.Developer.Module).NameOpen(\"git-source-control\").VersionString" > package.script