fix: handle env-vars case sensitive

Closes #1488

pkg/model/workflow.go

@@ -458,16 +458,8 @@ func (s *Step) String() string {
 }
 
 // Environments returns string-based key=value map for a step
-// Note: all keys are uppercase
 func (s *Step) Environment() map[string]string {
-	env := environment(s.Env)
-
-	for k, v := range env {
-		delete(env, k)
-		env[strings.ToUpper(k)] = v
-	}
-
-	return env
+	return environment(s.Env)
 }
 
 // GetEnv gets the env for a step

pkg/runner/step.go

@@ -183,7 +183,7 @@ func setupEnv(ctx context.Context, step step) error {
 			(*step.getEnv())[k] = exprEval.Interpolate(ctx, v)
 		}
 	}
-	// after we have an evaluated step context, update the expresson evaluator with a new env context
+	// after we have an evaluated step context, update the expressions evaluator with a new env context
 	// you can use step level env in the with property of a uses construct
 	exprEval = rc.NewExpressionEvaluatorWithEnv(ctx, *step.getEnv())
 	for k, v := range *step.getEnv() {

pkg/runner/testdata/environment-variables/push.yml

@@ -0,0 +1,33 @@
+name: environment variables
+on: push
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Test on job level
+        run: |
+          echo \$UPPER=$UPPER
+          echo \$upper=$upper
+          echo \$LOWER=$LOWER
+          echo \$lower=$lower
+          [[ "$UPPER" = "UPPER" ]] || exit 1
+          [[ "$upper" = "" ]] || exit 1
+          [[ "$LOWER" = "" ]] || exit 1
+          [[ "$lower" = "lower" ]] || exit 1
+      - name: Test on step level
+        run: |
+          echo \$UPPER=$UPPER
+          echo \$upper=$upper
+          echo \$LOWER=$LOWER
+          echo \$lower=$lower
+          [[ "$UPPER" = "upper" ]] || exit 1
+          [[ "$upper" = "" ]] || exit 1
+          [[ "$LOWER" = "" ]] || exit 1
+          [[ "$lower" = "LOWER" ]] || exit 1
+        env:
+          UPPER: upper
+          lower: LOWER
+    env:
+      UPPER: UPPER
+      lower: lower