Add pre-merge-test GitHub Actions workflow (#7)

* Add pre-merge-test GitHub Actions workflow

* Add pre-merge-test GitHub Actions workflow

* test

* bug fix

.github/workflows/pre-merge-test.yml

@@ -0,0 +1,132 @@
+name: Pre-Merge Test
+
+on:
+  issue_comment:
+    types:
+      - created
+  pull_request:
+    branches:
+      - '**'
+
+jobs:
+  pre-merge-test:
+    if: startsWith(github.event.comment.body, '/pre-merge-test')
+    runs-on: ubuntu-latest
+
+    steps:
+      # Step 1: Debugging - Echo VALID_USERS and BUILDKITE_TOKEN
+      - name: Debug Secrets
+        env:
+          VALID_USERS: ${{ secrets.VALID_USERS }}
+          BUILDKITE_TOKEN: ${{ secrets.BUILDKITE_TOKEN }}
+        run: |
+          echo "Debugging Secrets:"
+          echo "VALID_USERS starts with: ${VALID_USERS:0:5}..."  # Print first 5 characters
+          echo "VALID_USERS length: ${#VALID_USERS}"
+          echo "BUILDKITE_TOKEN starts with: ${BUILDKITE_TOKEN:0:5}..."  # Print first 5 characters
+          echo "BUILDKITE_TOKEN length: ${#BUILDKITE_TOKEN}"
+
+      # Step 2: Validate User and Comment
+      - name: Validate User and Comment
+        id: validate_user
+        env:
+          VALID_USERS: ${{ secrets.VALID_USERS }}
+        run: |
+          IFS=',' read -ra VALID_USERS_ARRAY <<< "$VALID_USERS"
+          COMMENT_BODY="${{ github.event.comment.body }}"
+          COMMENT_USER="${{ github.event.sender.login }}"
+          ACTION="${{ github.event.action }}"
+          echo "Valid users: ${VALID_USERS_ARRAY[@]}"
+          echo "Comment user: $COMMENT_USER"
+          echo "Action: $ACTION"
+          if [[ "${ACTION}" != "created" ]]; then
+            echo "Invalid action: ${ACTION}"
+            echo "valid=false" >> $GITHUB_ENV
+            exit 0
+          fi
+          USER_IS_VALID=false
+          for VALID_USER in "${VALID_USERS_ARRAY[@]}"; do
+            if [[ "$VALID_USER" == "$COMMENT_USER" ]]; then
+              USER_IS_VALID=true
+              break
+            fi
+          done
+          if [[ "$USER_IS_VALID" == "false" ]]; then
+            echo "Invalid user: ${COMMENT_USER}"
+            echo "valid=false" >> $GITHUB_ENV
+            exit 0
+          fi
+          if [[ ! "${COMMENT_BODY}" =~ ^/pre-merge-test ]]; then
+            echo "Invalid comment format: ${COMMENT_BODY}"
+            echo "valid=false" >> $GITHUB_ENV
+            exit 0
+          fi
+          echo "valid=true" >> $GITHUB_ENV
+
+      # Step 3: Stop the job if the user/comment is invalid
+      - name: Exit if Invalid User/Comment
+        if: env.valid == 'false'
+        run: echo "Exiting because the user/comment is invalid."
+
+      # Step 4: Parse Environment Variables
+      - name: Parse Environment Variables
+        if: env.valid == 'true'
+        id: parse_envs
+        run: |
+          COMMENT_BODY="${{ github.event.comment.body }}"
+          ENV_ARGS=$(echo "${COMMENT_BODY}" | sed -E 's|/pre-merge-test ?||')
+          ALLOWED_ENVS=("aws" "azure" "gcp")
+          FINAL_ENVS=()
+          if [[ -z "${ENV_ARGS}" ]]; then
+            FINAL_ENVS+=("aws")
+          else
+            IFS=',' read -ra ENV_LIST <<< "${ENV_ARGS}"
+            for ENV in "${ENV_LIST[@]}"; do
+              ENV=$(echo "$ENV" | xargs)
+              if [[ " ${ALLOWED_ENVS[@]} " =~ " ${ENV} " ]]; then
+                FINAL_ENVS+=("$ENV")
+              fi
+            done
+          fi
+          if [[ ${#FINAL_ENVS[@]} -eq 0 ]]; then
+            FINAL_ENVS+=("aws")
+          fi
+          ENV_JSON="{"
+          for ENV in "${FINAL_ENVS[@]}"; do
+            ENV_JSON+="\"$ENV\":\"1\","
+          done
+          ENV_JSON="${ENV_JSON%,}}"
+          echo "Parsed environments: ${ENV_JSON}"
+          echo "envs=${ENV_JSON}" >> $GITHUB_ENV
+
+      # Step 5: Trigger Buildkite Pipeline
+      - name: Trigger Buildkite Pipeline
+        if: env.valid == 'true'
+        env:
+          BUILDKITE_TOKEN: ${{ secrets.BUILDKITE_TOKEN }}
+        run: |
+          PR_API_URL="${{ github.event.issue.pull_request.url }}"
+          AUTH_HEADER="Authorization: Bearer $BUILDKITE_TOKEN"
+          PR_DATA=$(curl -s -H "$AUTH_HEADER" "$PR_API_URL")
+          HEAD=$(echo "$PR_DATA" | jq -r '.head.ref')
+          COMMIT=$(echo "$PR_DATA" | jq -r '.head.sha')
+          PULL_REQUEST_REPO=$(echo "$PR_DATA" | jq -r '.head.repo.html_url')
+          BASE_BRANCH=$(echo "$PR_DATA" | jq -r '.base.ref')
+          PR_NUMBER=$(echo "$PR_DATA" | jq -r '.number')
+          TITLE=$(echo "$PR_DATA" | jq -r '.title')
+          BUILDKITE_PAYLOAD=$(jq -n \
+            --arg commit "$COMMIT" \
+            --arg branch "$HEAD" \
+            --arg message "PR #$PR_NUMBER: $TITLE triggered by: ${{ github.event.sender.login }}" \
+            --arg pull_request_repository "$PULL_REQUEST_REPO" \
+            --argjson envs "$envs" \
+            '{
+              commit: $commit,
+              branch: $branch,
+              message: $message,
+              pull_request_repository: $pull_request_repository,
+              ignore_pipeline_branch_filters: true,
+              env: $envs
+            }')
+          BUILDKITE_URL="https://api.buildkite.com/v2/organizations/skypilot-1/pipelines/test-smoke-tests-required-before-merging/builds"
+          curl -X POST -H "$AUTH_HEADER" -H "Content-Type: application/json" -d "$BUILDKITE_PAYLOAD" "$BUILDKITE_URL"