Enable workflow to run on fork pull requests (#435)

.github/workflows/ci-chromatic.yaml

@@ -2,6 +2,7 @@ name: 'CI Chromatic'
 
 on:
   push:
+  pull_request_target:
 jobs:
   chromatic-deployment:
     runs-on: ubuntu-latest

.github/workflows/ci-docs.yaml

@@ -1,6 +1,7 @@
 name: CI Docs
 on:
   push:
+  pull_request_target:
 jobs:
   docs-build:
     runs-on: ubuntu-latest

.github/workflows/ci-front.yaml

@@ -1,6 +1,7 @@
 name: CI Front
 on:
   push:
+  pull_request_target:
 jobs:
   front-test:
     runs-on: ubuntu-latest

.github/workflows/ci-server.yaml

@@ -1,6 +1,7 @@
 name: CI Server
 on:
   push:
+  pull_request_target:
 jobs:
   server-test:
     runs-on: ubuntu-latest