Try chromium, also, try installing it. It's a long shot ... :)

.drone.yml

@@ -6,6 +6,7 @@ steps:
   - name: install
     image: node:20-alpine
     commands:
+      - apk add chromium
       - npm install
       - npm run test:ci
       - npm run e2e

package.json

@@ -25,7 +25,7 @@
     "build": "ng build",
     "watch": "ng build --watch --configuration development",
     "test": "ng test",
-    "test:ci": "ng test --no-watch --no-progress --browsers=ChromeHeadless"
+    "test:ci": "ng test --no-watch --no-progress --browsers=ChromiumHeadless"
   },
   "private": true,
   "dependencies": {