Fix CI not triggered (#6397)

In #6386 , checkout@v2 is brought in for checkout.

However, it's checking out PR merge commit by default, therefore breaks diff-only action which looking for commits that a PR is based on. And make all tests skipped.

This PR fixes this issue. and has been proven to work with #6396 Brokers/unit-tests.

.github/workflows/ci-cpp.yaml

@@ -34,6 +34,9 @@ jobs:
 
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-go-functions-style.yaml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: Check out code into the Go module directory
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-go-functions-test.yaml

@@ -36,6 +36,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-integration-backwards-compatibility.yaml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-integration-cli.yaml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-integration-function-state.yaml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-integration-messaging.yaml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-integration-process.yaml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-integration-schema.yaml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-integration-sql.yaml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-integration-standalone.yaml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-integration-thread.yaml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-integration-tiered-filesystem.yaml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-integration-tiered-jcloud.yaml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-license.yaml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Set up JDK 1.8
         uses: actions/setup-java@v1

.github/workflows/ci-pulsarbot.yaml

@@ -32,6 +32,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
       - name: Execute pulsarbot command
         id:   pulsarbot
         env:

.github/workflows/ci-unit-adaptors.yml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-unit-broker-sasl.yml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-unit-broker.yml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-unit-flaky.yaml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-unit-proxy.yaml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs

.github/workflows/ci-unit.yaml

@@ -33,6 +33,9 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Check if this pull request only changes documentation
         id:   docs