cache /_/info marshaled data; restructure dockerfile

Dockerfile

@@ -5,22 +5,22 @@ ARG TARGETOS
 ARG TARGETARCH
 
 WORKDIR /build
-COPY . .
 
 # fuck google
 RUN go env -w GOPROXY=direct
 
 RUN go install github.com/a-h/templ/cmd/templ@latest
-RUN templ generate
-
 RUN go install github.com/dlclark/regexp2cg@main
-RUN go generate ./lib/*
 
+COPY . .
+# usually soundcloakctl updates together with soundcloak, so we should redownload it
 RUN go install git.maid.zone/stuff/soundcloakctl@master
-RUN soundcloakctl config codegen
-# this downloads JS modules (currently only hls.js) from jsdelivr and stores them locally for serving
 RUN soundcloakctl js download
 
+RUN templ generate
+RUN go generate ./lib/*
+RUN soundcloakctl config codegen
+
 RUN CGO_ENABLED=0 GOARCH=${TARGETARCH} GOOS=${TARGETOS} go build -ldflags "-s -w -extldflags '-static'" -o ./app
 RUN echo "soundcloak:x:5000:5000:Soundcloak user:/:/sbin/nologin" > /etc/minimal-passwd && \
   echo "soundcloak:x:5000:" > /etc/minimal-group

main.go

@@ -340,8 +340,7 @@ func main() {
 			DefaultPreferences cfg.Preferences
 		}
 
-		app.Get("/_/info", func(c *fiber.Ctx) error {
-			return c.JSON(info{
+		inf, err := json.Marshal(info{
 			Commit:             cfg.Commit,
 			Repo:               cfg.Repo,
 			ProxyImages:        cfg.ProxyImages,
@@ -350,6 +349,13 @@ func main() {
 			GetWebProfiles:     cfg.GetWebProfiles,
 			DefaultPreferences: cfg.DefaultPreferences,
 		})
+		if err != nil {
+			log.Fatalln("failed to marshal info: ", err)
+		}
+
+		app.Get("/_/info", func(c *fiber.Ctx) error {
+			c.Set("Content-Type", "application/json")
+			return c.Send(inf)
 		})
 	}