feat(ci): add CI workflow e2e test with cold/warm builds

.gitea/workflows/ci.yml

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+name: Go CI with S3 Caching
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Add SSH known host
+        run: |
+          install -m 700 -d "$HOME/.ssh"
+          ssh-keyscan -H git.ericxliu.me > $HOME/.ssh/known_hosts
+
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          ssh-key: ${{ secrets.SSH_KEY }}
+
+      - name: Setup Go + S3 Caching
+        uses: ./.gitea/actions/go-cache
+        with:
+          go-version: '1.24'
+          s3-bucket: sccache
+          s3-endpoint: https://s3.ericxliu.me
+          s3-path-style: "true"
+        env:
+          SCCACHE_AWS_ACCESS_KEY_ID: ${{ secrets.SCCACHE_AWS_ACCESS_KEY_ID }}
+          SCCACHE_AWS_SECRET_ACCESS_KEY: ${{ secrets.SCCACHE_AWS_SECRET_ACCESS_KEY }}
+          AWS_REGION: auto
+
+      - name: Clean Local Go Cache (Start Fresh)
+        run: |
+          echo "Clearing local cache..."
+          go clean -cache
+
+      - name: Cold Build (Cache Miss / Populates S3)
+        run: |
+          echo "Running cold build..."
+          time go build -o test-binary main.go
+
+      - name: Clean Local Go Cache (Forces Remote Fetch)
+        run: |
+          echo "Clearing local cache to force remote S3 fetch..."
+          go clean -cache
+
+      - name: Warm Build (Cache Hit / Fetches from S3)
+        run: |
+          echo "Running warm build..."
+          time go build -o test-binary main.go
+
+      - name: Run Test Binary
+        run: ./test-binary

main.go

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+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main() {
+	fmt.Printf("Hello, Gitea Actions with Go caching on S3! Built at: %s\n", time.Now().Format(time.RFC3339))
+}