github ci fix attempt, speedup docker build on CI

Dockerfile

@@ -1,13 +1,25 @@
+# Stage 1: Builder
 FROM golang:1.23.1-alpine AS builder
 RUN apk add --no-cache tzdata
-COPY src /src
-ENV GOCACHE=/root/.cache/go-build
+
 WORKDIR /src
+
+# Only copy go.mod and go.sum initially for better caching
+COPY src/go.mod src/go.sum ./
+
+# Utilize build cache
+RUN --mount=type=cache,target="/go/pkg/mod" \
+    go mod download
+
+# Now copy the remaining files
+COPY src/ ./
+
+# Build the application with better caching
 RUN --mount=type=cache,target="/go/pkg/mod" \
     --mount=type=cache,target="/root/.cache/go-build" \
-    go mod download && \
-    CGO_ENABLED=0 GOOS=linux go build -pgo=auto -o go-proxy github.com/yusing/go-proxy
+    CGO_ENABLED=0 GOOS=linux go build -pgo=auto -o go-proxy ./
 
+# Stage 2: Final image
 FROM scratch
 
 LABEL maintainer="yusing@6uo.me"
@@ -17,9 +29,11 @@ COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
 
 # copy binary
 COPY --from=builder /src/go-proxy /app/
-COPY schema/ /app/schema
 
-# copy cert required for setup
+# copy schema directory
+COPY schema/ /app/schema/
+
+# copy certs
 COPY --from=builder /etc/ssl/certs /etc/ssl/certs
 
 ENV DOCKER_HOST=unix:///var/run/docker.sock
@@ -30,4 +44,5 @@ EXPOSE 8888
 EXPOSE 443
 
 WORKDIR /app
-CMD ["/app/go-proxy"]
+
+CMD ["/app/go-proxy"]