Update dockerfile

- Remove entire frontend build stage since not needed anymore until
  backend is good enough
- Hopefully help with caching dependencies for the go build

Dockerfile

@@ -1,21 +1,15 @@
-FROM docker.io/node:22 AS build-ember
-# TODO: Implement ember frontend build
-COPY . /app
-WORKDIR /app/frontend-reactive
-RUN npm install
-RUN npm run build
-
+# TODO: Add build for frontend here
 FROM docker.io/golang:1.24 AS build-go
-# TODO: Implement golang build
 
-COPY --from=build-ember /app /app
+COPY go.mod /app/go.mod
+COPY go.sum /app/go.sum
 WORKDIR /app
 RUN GOTOOLCHAIN=auto GOSUMDB=sum.golang.org go get
+
+COPY . /app
 RUN CGO_ENABLED=0 GOTOOLCHAIN=auto GOSUMDB=sum.golang.org go build -o /app/linstrom .
 
-# FROM fedora:latest AS release
 FROM alpine:3 AS release
-# TODO: Implement final release container
 
 COPY --from=build-go /app/linstrom /linstrom
 
@@ -39,4 +33,4 @@ LABEL org.opencontainers.image.title="Linstrom"
 LABEL org.opencontainers.image.description="A social media server acting as part of the fediverse"
 # Make this automatic since latest distroless image gets update constantly
 # LABEL org.opencontainers.image.base.digest="digest/hash of base image"
-LABEL org.opencontainers.image.base.name="gcr.io/distroless/static-debian12:latest"
+LABEL org.opencontainers.image.base.name="scratch"