abort workflow if no changes found

.github/workflows/deploy-changed-samples.yml

@@ -32,32 +32,37 @@ jobs:
             | sort \
             | uniq > changed_samples.txt
           if [ -s changed_samples.txt ]; then
+            echo "should_continue=true" >> $GITHUB_ENV
             echo "The following samples have changed:"
             cat changed_samples.txt
           else
+            echo "should_continue=false" >> $GITHUB_ENV
             echo "No samples have changed. Exiting..."
           fi
-
       - name: Install Golang
         uses: actions/setup-go@v5
         with:
           go-version-file: tools/testing/go.mod
           cache-dependency-path: |
             tools/testing/go.sum
+        if: env.should_continue == 'true'
 
       - name: Build the test tool using Go
         run: |
           go mod tidy
           go build ./cmd/loadtest
         working-directory: tools/testing/
+        if: env.should_continue == 'true'
 
       - name: Install Defang
         run: |
           eval "$(curl -fsSL s.defang.io/install)"
+        if: env.should_continue == 'true'
 
       - name: Run tests
         id: run-tests
         shell: bash # implies set -o pipefail, so pipe below will keep the exit code from loadtest
+        if: env.should_continue == 'true'
         env:
           FIXED_VERIFIER_PK: ${{ secrets.FIXED_VERIFIER_PK }}
           TEST_AWS_ACCESS_KEY: ${{ secrets.TEST_AWS_ACCESS_KEY }}
@@ -92,16 +97,14 @@ jobs:
         run: |
           SAMPLES=$(sed 's|^samples/||' changed_samples.txt | paste -s -d ',' -)
           echo "Running tests for samples: $SAMPLES"
-
           mkdir output
           # concurrency is set to 10 to avoid exhausting our fargate vCPU limits when running
           # kaniko builds, which consume 4 vCPUs each. the limit is currently set to 60--6.5 of
           # which are used to run the staging stack. So floor((60-6.5)/4) = 13 is our upper limit
           ./tools/testing/loadtest -c fabric-staging.defang.dev:443 --timeout=15m --concurrency=10 -s $SAMPLES -o output --markdown=true | tee output/summary.log | grep -v '^\s*[-*]' # removes load sample log lines
-
       - name: Upload Output as Artifact
         uses: actions/upload-artifact@v4
-        if: success() || steps.run-tests.outcome == 'failure' # Always upload result unless cancelled
+        if: env.should_continue == 'true' && (success() || steps.run-tests.outcome == 'failure') # Always upload result unless cancelled
         with:
           name: program-output
           path: output/**