build(ci): multi-stage docker builds

ci.Dockerfile

@@ -1,44 +1,38 @@
-# build app
-FROM --platform=$BUILDPLATFORM golang:1.20-alpine3.19 AS app-builder
-
-ARG VERSION=dev
-ARG REVISION=dev
-ARG BUILDTIME
-ARG TARGETOS TARGETARCH
-
-RUN apk add --no-cache git tzdata
+# build base
+FROM --platform=$BUILDPLATFORM golang:1.20-alpine3.19 AS app-base
 
 ENV SERVICE=seasonpackarr
-
 WORKDIR /src
+ARG VERSION=dev \
+    REVISION=dev \
+    BUILDTIME \
+    TARGETOS TARGETARCH
 
-# Cache Go modules
 COPY go.mod go.sum ./
 RUN go mod download
-
 COPY . ./
 
+# build seasonpackarr
+FROM --platform=$BUILDPLATFORM app-base AS seasonpackarr
+
 RUN --mount=target=. \
     GOOS=$TARGETOS GOARCH=$TARGETARCH go build -ldflags "-s -w -X main.version=${VERSION} -X main.commit=${REVISION} -X main.date=${BUILDTIME}" -o /out/bin/seasonpackarr cmd/seasonpackarr/main.go
 
 # build runner
 FROM alpine:latest as RUNNER
+RUN apk add --no-cache ca-certificates curl tzdata jq
 
-LABEL org.opencontainers.image.source = "https://github.com/nuxencs/seasonpackarr"
-LABEL org.opencontainers.image.licenses = "GPL-2.0-or-later"
-LABEL org.opencontainers.image.base.name = "alpine:latest"
+LABEL org.opencontainers.image.source = "https://github.com/nuxencs/seasonpackarr" \
+      org.opencontainers.image.licenses = "GPL-2.0-or-later" \
+      org.opencontainers.image.base.name = "alpine:latest"
 
 ENV HOME="/config" \
     XDG_CONFIG_HOME="/config" \
     XDG_DATA_HOME="/config"
 
-RUN apk add --no-cache ca-certificates curl tzdata jq
-
 WORKDIR /app
 VOLUME /config
 EXPOSE 42069
-
-COPY --link --from=app-builder /out/bin/seasonpackarr /usr/bin/
-
-
 ENTRYPOINT ["/usr/bin/seasonpackarr", "start", "--config", "/config"]
+
+COPY --link --from=seasonpackarr /out/bin/seasonpackarr /usr/bin/