Update Dockerfile

Dockerfile

@@ -1,14 +1,35 @@
-FROM techknowlogick/xgo as build
+# Set the default Go version as a build argument
+ARG XGO="go-1.20.x"
 
+# Use xgo (a Go cross-compiler tool) as the base image
+FROM  --platform=$BUILDPLATFORM techknowlogick/xgo:${XGO} as build
+
+# Set the working directory to /workspace and copy the source code
 WORKDIR /workspace
-
 COPY . .
-RUN CGO_ENABLED=1 go build -tags 'sqlite sqlite_unlock_notify netgo' -ldflags '-s -w -extldflags "-static" -linkmode external' .
 
+# Set the target architecture (can be set using --build-arg), buildx set it automatically
+ARG TARGETOS TARGETARCH
+
+# Build the binary using xgo
+RUN --mount=type=cache,target=/root/.cache/go-build \
+    --mount=type=cache,target=/go/pkg \
+    GOOS=${TARGETOS} GOARCH=${TARGETARCH} CGO_ENABLED=1 \
+    go build -tags 'sqlite sqlite_unlock_notify netgo' -ldflags '-s -w -extldflags "-static" -linkmode external' .
+
+# Use a scratch image as the base image for the final container,
+# which will contain only the built binary and the CA certificates
 FROM scratch
+
+# Copy the built binary and the CA certificates from the build container to the final container
 COPY --from=build /workspace/pages /pages
 COPY --from=build \
     /etc/ssl/certs/ca-certificates.crt \
     /etc/ssl/certs/ca-certificates.crt
 
+# Expose ports 80 and 443 for the built binary to listen on
+EXPOSE 80/tcp
+EXPOSE 443/tcp
+
+# Set the entrypoint for the container to the built binary
 ENTRYPOINT ["/pages"]