big build optimization

Dockerfile

@@ -1,13 +1,19 @@
 FROM golang:1.25.5-alpine3.23 AS builder
+ARG BUILD_TIME
+ARG GIT_COMMIT
 WORKDIR /usr/src/kurumi
 COPY go.mod go.sum ./
-RUN go mod download
+RUN --mount=type=cache,target=/go/pkg/mod go mod download
 COPY ./database ./database
 COPY ./laniakea ./laniakea
 COPY ./plugins ./plugins
 COPY ./utils ./utils
 COPY ./main.go ./
-RUN --mount=type=cache,target=/go/pkg/mod CGO_ENABLED=0 go build -trimpath -ldflags="-s -w -X kurumibot/utils.BuildTime=$(date \"+%H:%M:%S %d.%m.%Y\")" -v -o /usr/local/bin/kurumi ./
+RUN --mount=type=cache,target=/root/.cache/go-build \
+    --mount=type=cache,target=/go/pkg/mod \
+    CGO_ENABLED=0 go build -trimpath \
+    -ldflags="-s -w -X 'kurumibot/utils.BuildTime=$BUILD_TIME' -X 'kurumibot/utils.GitCommit=$GIT_COMMIT'" \
+    -v -o /usr/local/bin/kurumi ./
 
 FROM alpine:3.23 AS runner
 WORKDIR /app