improvement(FF): CI check to prevent hardcoding of FFs (#2790)

* improvement(FF): CI check to prevent hardcoding of FFs

* revert test change

* add FF lint checks

.github/workflows/test-build.yml

@@ -38,6 +38,41 @@ jobs:
       - name: Install dependencies
         run: bun install --frozen-lockfile
 
+      - name: Validate feature flags
+        run: |
+          FILE="apps/sim/lib/core/config/feature-flags.ts"
+          ERRORS=""
+
+          echo "Checking for hardcoded boolean feature flags..."
+
+          # Use perl for multiline matching to catch both:
+          #   export const isHosted = true
+          #   export const isHosted =
+          #     true
+          HARDCODED=$(perl -0777 -ne 'while (/export const (is[A-Za-z]+)\s*=\s*\n?\s*(true|false)\b/g) { print "  $1 = $2\n" }' "$FILE")
+
+          if [ -n "$HARDCODED" ]; then
+            ERRORS="${ERRORS}\n❌ Feature flags must not be hardcoded to boolean literals!\n\nFound hardcoded flags:\n${HARDCODED}\n\nFeature flags should derive their values from environment variables.\n"
+          fi
+
+          echo "Checking feature flag naming conventions..."
+
+          # Check that all export const (except functions) start with 'is'
+          # This finds exports like "export const someFlag" that don't start with "is" or "get"
+          BAD_NAMES=$(grep -E "^export const [a-z]" "$FILE" | grep -vE "^export const (is|get)" | sed 's/export const \([a-zA-Z]*\).*/  \1/')
+
+          if [ -n "$BAD_NAMES" ]; then
+            ERRORS="${ERRORS}\n❌ Feature flags must use 'is' prefix for boolean flags!\n\nFound incorrectly named flags:\n${BAD_NAMES}\n\nExample: 'hostedMode' should be 'isHostedMode'\n"
+          fi
+
+          if [ -n "$ERRORS" ]; then
+            echo ""
+            echo -e "$ERRORS"
+            exit 1
+          fi
+
+          echo "✅ All feature flags are properly configured"
+
       - name: Lint code
         run: bun run lint:check