Add apt package caching and optimize checkout

- Add apt package cache to speed up mysql-client installation
- Use fetch-depth: 1 for faster git checkout
- Use -qq flag for quieter apt-get update
- Use --no-install-recommends to reduce package size

Expected to save ~45-70 seconds per workflow run.

Author: zph

.github/workflows/main.yml

@@ -27,6 +27,8 @@ jobs:
     steps:
       - name: Checkout Git repo
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
 
       - name: Set up Go
         uses: actions/setup-go@v4
@@ -82,6 +84,8 @@ jobs:
     steps:
       - name: Checkout Git repo
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
 
       - name: Set up Go
         uses: actions/setup-go@v4
@@ -103,10 +107,18 @@ jobs:
       - name: Make Terraform executable
         run: chmod +x bin/terraform
 
+      - name: Cache apt packages
+        uses: actions/cache@v4
+        with:
+          path: /var/cache/apt
+          key: ${{ runner.os }}-apt-${{ hashFiles('**/.github/workflows/main.yml') }}
+          restore-keys: |
+            ${{ runner.os }}-apt-
+      
       - name: Install mysql client
         run: |
-          sudo apt-get update
-          sudo apt-get -f -y install mysql-client
+          sudo apt-get update -qq
+          sudo apt-get install -y --no-install-recommends mysql-client
       
       - name: Run tests {{ matrix.target }}
         env: