chore: update the workflow of pull requests

.github/workflows/pull-request.yml

@@ -0,0 +1,17 @@
+name: Check pull request target
+on:
+  pull_request_target:
+    types:
+      - opened
+      - reopened
+      - synchronize
+jobs:
+  check-branches:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check target branch
+        run: |
+          if [ ${{ github.base_ref }} == "master" ] && [ ${{ github.head_ref }} != "dev" ]; then
+            echo "Only pull requests from dev branch are only allowed to be merged into master branch."
+            exit 1
+          fi

.github/workflows/test.yml

@@ -10,6 +10,7 @@ on:
       - '.github/FUNDING.yml'
       - '.github/release-drafter.yml'
       - '.github/ISSUE_TEMPLATE/*'
+      - '.github/workflows/pull-request.yaml'
       - '.github/workflows/release-drafter.yaml'
       - 'examples/*'
   pull_request:
@@ -21,6 +22,7 @@ on:
       - '.github/FUNDING.yml'
       - '.github/release-drafter.yml'
       - '.github/ISSUE_TEMPLATE/*'
+      - '.github/workflows/pull-request.yaml'
       - '.github/workflows/release-drafter.yaml'
       - 'examples/*'
 

CONTRIBUTING.md

@@ -6,7 +6,7 @@
   - Review existing issues and provide feedback or react to them.
 
 ## With pull requests:
-  - Open your pull request against `master`.
+  - Open your pull request against `dev`.
   - Open one pull request for only one feature/proposal, if you have several those, please put them into different PRs, whereas you are allowed to open one pull request with several bug-fixs.
   - Your pull request should have no more than two commits, if not, you should squash them.
   - It should pass all tests in the available continuous integrations systems such as TravisCI.