ci: Implement parallel submodule cloning for faster CI/CD performance (#13045)

Author: Copilot

.github/actions/clone-submodules/action.yml

@@ -36,47 +36,12 @@ inputs:
 runs:
   using: composite
   steps:
-    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
-      if: ${{ inputs.test262 == 'true' }}
-      with:
-        show-progress: false
-        persist-credentials: false
-        repository: tc39/test262
-        path: tasks/coverage/test262
-        ref: 4b5d36ab6ef2f59d0a8902cd383762547a3a74c4
-
-    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
-      if: ${{ inputs.babel == 'true' }}
-      with:
-        show-progress: false
-        persist-credentials: false
-        repository: babel/babel
-        path: tasks/coverage/babel
-        ref: 98d18aa4f66ce300a6a863bad223ab67b3fdf282
-
-    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
-      if: ${{ inputs.typescript == 'true' }}
-      with:
-        show-progress: false
-        persist-credentials: false
-        repository: microsoft/TypeScript
-        path: tasks/coverage/typescript
-        ref: 81c951894e93bdc37c6916f18adcd80de76679bc
-
-    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
-      if: ${{ inputs.prettier == 'true' }}
-      with:
-        show-progress: false
-        persist-credentials: false
-        repository: prettier/prettier
-        path: tasks/prettier_conformance/prettier
-        ref: 7584432401a47a26943dd7a9ca9a8e032ead7285 # v3.5.0
-
-    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
-      if: ${{ inputs.acorn-test262 == 'true' }}
-      with:
-        show-progress: false
-        persist-credentials: false
-        repository: oxc-project/acorn-test262
-        path: tasks/coverage/acorn-test262
-        ref: d9ba02ddea22800a285c7ad24e3fbfbb00ccbb02 # Latest main at 1/7/25
+    - name: Clone submodules in parallel
+      shell: bash
+      run: |
+        ${{ github.action_path }}/clone-parallel.sh \
+          "${{ inputs.test262 }}" \
+          "${{ inputs.babel }}" \
+          "${{ inputs.typescript }}" \
+          "${{ inputs.prettier }}" \
+          "${{ inputs.acorn-test262 }}"

.github/actions/clone-submodules/clone-parallel.sh

@@ -0,0 +1,74 @@
+#!/bin/bash
+
+# Clone submodules in parallel for faster setup
+# Usage: ./clone-parallel.sh [test262] [babel] [typescript] [prettier] [acorn-test262]
+# Arguments: "true" or "false" for each submodule
+
+set -euo pipefail
+
+# Default values
+TEST262=${1:-true}
+BABEL=${2:-true}
+TYPESCRIPT=${3:-true}
+PRETTIER=${4:-true}
+ACORN_TEST262=${5:-true}
+
+# Array to store background process PIDs
+declare -a PIDS=()
+
+# Function to clone a repository in the background
+clone_repo() {
+    local should_clone="$1"
+    local repo="$2"
+    local path="$3"
+    local ref="$4"
+    local name="$5"
+    
+    if [[ "$should_clone" == "true" ]]; then
+        echo "Starting clone of $name..."
+        (
+            # Create the directory structure if it doesn't exist
+            mkdir -p "$(dirname "$path")"
+            
+            # Clone the repository with minimal progress output
+            git clone --quiet --no-progress --single-branch --depth 1 \
+                "https://github.com/$repo.git" "$path"
+            
+            # Checkout the specific commit
+            cd "$path"
+            git fetch --quiet --depth 1 origin "$ref"
+            git checkout --quiet "$ref"
+            
+            echo "✓ Completed clone of $name"
+        ) &
+        PIDS+=($!)
+    else
+        echo "Skipping $name"
+    fi
+}
+
+echo "Cloning submodules in parallel..."
+
+# Start all clone operations in parallel
+clone_repo "$TEST262" "tc39/test262" "tasks/coverage/test262" "4b5d36ab6ef2f59d0a8902cd383762547a3a74c4" "test262"
+clone_repo "$BABEL" "babel/babel" "tasks/coverage/babel" "98d18aa4f66ce300a6a863bad223ab67b3fdf282" "babel"
+clone_repo "$TYPESCRIPT" "microsoft/TypeScript" "tasks/coverage/typescript" "81c951894e93bdc37c6916f18adcd80de76679bc" "typescript"
+clone_repo "$PRETTIER" "prettier/prettier" "tasks/prettier_conformance/prettier" "7584432401a47a26943dd7a9ca9a8e032ead7285" "prettier"
+clone_repo "$ACORN_TEST262" "oxc-project/acorn-test262" "tasks/coverage/acorn-test262" "d9ba02ddea22800a285c7ad24e3fbfbb00ccbb02" "acorn-test262"
+
+# Wait for all background processes to complete
+echo "Waiting for all clone operations to complete..."
+failed_count=0
+for pid in "${PIDS[@]}"; do
+    if ! wait "$pid"; then
+        echo "❌ Clone operation failed (PID: $pid)"
+        ((failed_count++))
+    fi
+done
+
+if [[ $failed_count -eq 0 ]]; then
+    echo "✅ All submodule clones completed successfully!"
+else
+    echo "❌ $failed_count clone operation(s) failed"
+    exit 1
+fi