ci: support precheck and stylecheck for v15

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,30 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: "[Bug]"
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. xxx
+2. xxx
+3. xxx
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment (please complete the following information):**
+ - OS: [e.g. CentOS 7]
+ - Version [e.g. 22]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,12 @@
+---
+name: Question
+about: Ask question about anything here.
+title: "[Question]"
+labels: question
+assignees: ''
+
+---
+
+**Describe the problem**
+
+...

.github/workflows/precheck.yml

@@ -0,0 +1,66 @@
+name: precheck
+
+on:
+  push:
+    branches: [ POLARDB_15_STABLE ]
+    paths:
+      - '.github/workflows/precheck.yml'
+      - 'config/**'
+      - 'contrib/**'
+      - 'external/**'
+      - 'src/**'
+      - 'configure*'
+      - 'build.sh'
+  pull_request:
+    branches: [ POLARDB_15_STABLE ]
+    paths:
+      - '.github/workflows/precheck.yml'
+      - 'config/**'
+      - 'contrib/**'
+      - 'external/**'
+      - 'src/**'
+      - 'configure*'
+      - 'build.sh'
+  # trigger testing manually
+  workflow_dispatch:
+
+jobs:
+  build_normal:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        container_image: [ ubuntu20.04, ubuntu22.04, ubuntu24.04, anolis8, rocky8, rocky9 ]
+        debug_mode: [ on, off ]
+    steps:
+      - name: fetch source code
+        uses: actions/checkout@v4
+
+      - name: create and start the container
+        run: |
+          docker create                                                  \
+            -t                                                           \
+            --name polardb_${{ matrix.container_image }}                 \
+            -v `pwd`:/home/postgres/PolarDB-for-PostgreSQL               \
+            polardb/polardb_pg_devel:${{ matrix.container_image }} \
+            bash &&                                                      \
+          docker start polardb_${{ matrix.container_image }}
+
+      - name: change ownership of the source code
+        run: |
+          docker exec                                            \
+            polardb_${{ matrix.container_image }}                \
+            bash -c "cd /home/postgres/PolarDB-for-PostgreSQL && \
+                     sudo chown -R postgres:postgres ./"
+
+      - name: build and run precheck
+        run: |
+          docker exec                                                \
+            polardb_${{ matrix.container_image }}                    \
+            bash -c "cd /home/postgres/PolarDB-for-PostgreSQL &&     \
+                     if [ -f /etc/bashrc ]; then source /etc/bashrc; fi && \
+                     ./build.sh --ws=1 --wr=2 --debug=${{ matrix.debug_mode }} --jobs=$jobs --ec='--enable-tap-tests' && \
+                     make precheck -j$jobs"
+
+      - name: change ownership of the source code back
+        run: |
+          sudo chown -R runner:runner `pwd`

.github/workflows/stylecheck.yml

@@ -0,0 +1,58 @@
+name: stylecheck
+
+on:
+  push:
+    branches: [ POLARDB_15_STABLE ]
+  pull_request:
+    branches: [ POLARDB_15_STABLE ]
+  # trigger testing manually
+  workflow_dispatch:
+
+jobs:
+  build_normal:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        container_image: [ ubuntu24.04 ]
+    steps:
+      - name: fetch PolarDB source code
+        uses: actions/checkout@v4
+        # for copyright check
+        with:
+          fetch-depth: 2
+
+      - name: create and start the container
+        run: |
+          docker create                                                  \
+            -t                                                           \
+            --name polardb_${{ matrix.container_image }}                 \
+            -v `pwd`:/home/postgres/PolarDB-for-PostgreSQL               \
+            polardb/polardb_pg_devel:${{ matrix.container_image }}       \
+            bash &&                                                      \
+          docker start polardb_${{ matrix.container_image }}
+
+      - name: change ownership of the source code
+        run: |
+          docker exec                                            \
+            polardb_${{ matrix.container_image }}                \
+            bash -c "cd /home/postgres/PolarDB-for-PostgreSQL && \
+                     sudo chown -R postgres:postgres ./"
+
+      - name: stylecheck
+        run: |
+          docker exec                                                \
+            polardb_${{ matrix.container_image }}                    \
+            bash -c "cd /home/postgres/PolarDB-for-PostgreSQL &&     \
+                     ./configure && make stylecheck"
+
+      - name: change ownership of the source code
+        run: |
+          sudo chown -R runner:runner `pwd`
+
+      - name: check diff
+        run: |
+          if [[ $(git diff --stat) != '' ]]; then                    \
+            git diff >> style.diff;                                  \
+            cat style.diff;                                          \
+            exit 1;                                                  \
+          fi

.github/workflows/sync-postgres.yml

@@ -0,0 +1,42 @@
+name: sync with postgres upstream
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 0 * * *"
+
+jobs:
+  repo-sync:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - name: repo-sync-master
+        uses: repo-sync/github-sync@v2
+        with:
+          source_repo: https://github.com/postgres/postgres.git
+          source_branch: master
+          destination_branch: master
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+      - name: repo-sync-17
+        uses: repo-sync/github-sync@v2
+        with:
+          source_repo: https://github.com/postgres/postgres.git
+          source_branch: REL_17_STABLE
+          destination_branch: REL_17_STABLE
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+      - name: repo-sync-16
+        uses: repo-sync/github-sync@v2
+        with:
+          source_repo: https://github.com/postgres/postgres.git
+          source_branch: REL_16_STABLE
+          destination_branch: REL_16_STABLE
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+      - name: repo-sync-15
+        uses: repo-sync/github-sync@v2
+        with:
+          source_repo: https://github.com/postgres/postgres.git
+          source_branch: REL_15_STABLE
+          destination_branch: REL_15_STABLE
+          github_token: ${{ secrets.GITHUB_TOKEN }}