Simplify a bit more

Author: llrs-roche

.github/workflows/build-check-install.yaml

@@ -526,15 +526,12 @@ jobs:
           # Set working directory where the git repo is
           cd ${{ github.event.repository.name }}/${{ inputs.package-subdirectory }}
 
-
-          test_all=$(git show -s --pretty=%B | grep -F "[run-all-tests]")
+          test_all=$(git show -s --pretty=%B | grep -F "[run-all-tests]" )
+          test_dir="tests/testthat/"
 
           # Get the list of R files that have changed
           # https://github.com/cloudnativeto/envoy/blob/de67446fa8af973761bb4716f5143d73643baf8b/.github/workflows/get_build_targets.sh_bak#L9
-          files=$(git diff --name-only HEAD FETCH_HEAD -- tests/* R/*.R)
-
-          # Base directories
-          test_dir="tests/testthat/"
+          files=$(git diff --name-only HEAD FETCH_HEAD -- $test_dir R/*.R)
 
           # Loop through each modified file and determine which tests to run
           for file in $files; do