[feat](test) Add skill documentation for docker-based regression testing (#61960)

Add comprehensive skill documentation for running Doris docker-based
regression tests from clean packages.

.claude/skills/doris-docker-regression/SKILL.md

@@ -0,0 +1,138 @@
+---
+name: doris-docker-regression
+description: Run Doris docker-based regression tests from a clean package
+compatibility: opencode
+---
+
+## Purpose
+
+Run Doris docker-based regression tests from a clean package, avoiding contamination from local `conf/` or startup script modifications.
+
+## Prerequisites
+
+### Python Environment
+
+Requires Python 3. Install dependencies from `docker/runtime/doris-compose/requirements.txt`:
+
+```bash
+python -m pip install --user -r docker/runtime/doris-compose/requirements.txt
+```
+
+If installation fails (especially PyYAML conflicts), use specific versions:
+```bash
+python -m pip install --user pyyaml==5.3.1 docker==6.1.3
+python -m pip install --user -r docker/runtime/doris-compose/requirements.txt
+```
+
+Alternatively, use a virtual environment:
+```bash
+python -m venv doris-compose-env
+source doris-compose-env/bin/activate
+pip install -r docker/runtime/doris-compose/requirements.txt
+```
+
+### Docker Environment
+
+```bash
+docker run hello-world       # Docker works
+docker compose version       # Compose v2
+docker-compose version       # Should resolve to Compose v2
+```
+
+If `docker-compose` shows `TypeError: kwargs_from_env()`, make sure it is indeed Docker Compose V2; if not, you need to install and point to the correct version.
+
+Check port availability:
+```bash
+lsof -nP -iTCP:8030,8040,8050,8060,8070,9010,9020,9030,9050,9060 -sTCP:LISTEN
+```
+If there is a conflict, ask the user how to handle it.
+
+## Build
+
+```bash
+./build.sh --fe --be -j<parallel_jobs> --output <output_directory>
+```
+
+## Prepare Clean Package
+
+Sanitize configs from git HEAD:
+
+```bash
+git show HEAD:conf/fe.conf > <output_directory>/fe/conf/fe.conf
+git show HEAD:conf/be.conf > <output_directory>/be/conf/be.conf
+git show HEAD:bin/start_fe.sh > <output_directory>/fe/bin/start_fe.sh
+chmod 755 <output_directory>/fe/bin/start_fe.sh
+```
+
+Verify clean configs use **default ports**:
+- `fe.conf`: 8030, 9020, 9030, 9010, 8070
+- `be.conf`: 9060, 8040, 9050, 8060, 8050
+- `start_fe.sh`: no `-agentlib:jdwp` debug agent
+
+## Build Docker Image
+
+```bash
+docker build \
+  --build-arg OUTPUT_PATH=<output_directory> \
+  -f docker/runtime/doris-compose/Dockerfile \
+  -t <image_name>:latest \
+  .
+```
+
+## Configure Regression
+
+Create `regression-test/conf/regression-conf-custom.groovy`:
+
+```groovy
+image = "<image_name>:latest"
+excludeDockerTest = false
+testGroups = "docker"
+```
+
+## Run Regression
+
+```bash
+./run-regression-test.sh --run -d <directory> -s <suite_name>
+```
+
+## Troubleshooting
+
+| Symptom | Cause | Fix |
+|---------|-------|-----|
+| 0 suites | `excludeDockerTest=true` or missing `testGroups="docker"` | Check `regression-conf-custom.groovy` |
+| JDWP error | `start_fe.sh` has debug agent | Re-sanitize from `git show HEAD:bin/start_fe.sh` |
+| Wrong ports | Configs have local edits | Re-sanitize from `git show HEAD:conf/fe.conf` / `be.conf` |
+| Port conflict | Processes using default ports | `lsof` then kill |
+
+## Debug Logs
+
+Runtime cluster at `/tmp/doris/<suite_name>/`:
+- `fe-1/log/fe.log`, `fe.warn.log`, `fe.out`, `health.out`
+- `be-1/log/be.INFO`, `be.WARNING`, `be.out`, `health.out`
+- `doris-compose.log`
+
+## Full Command Sequence
+
+```bash
+# 1. Check environment
+python --version
+docker run hello-world
+docker compose version
+lsof -nP -iTCP:8030,8040,8050,8060,8070,9010,9020,9030,9050,9060 -sTCP:LISTEN
+
+# 2. Build
+./build.sh --fe --be -j60
+
+# 3. Sanitize package configs
+git show HEAD:conf/fe.conf > <output_directory>/fe/conf/fe.conf
+git show HEAD:conf/be.conf > <output_directory>/be/conf/be.conf
+git show HEAD:bin/start_fe.sh > <output_directory>/fe/bin/start_fe.sh
+chmod 755 <output_directory>/fe/bin/start_fe.sh
+
+# 4. Build image
+docker build --build-arg OUTPUT_PATH=<output_directory> -f docker/runtime/doris-compose/Dockerfile -t <image_name>:latest .
+
+# 5. Configure (create regression-conf-custom.groovy)
+# 6. Run
+./run-regression-test.sh --run -d <directory> -s <suite_name>
+```