build: build Go images from the repo root for the shared module

Also pins the explicit shared require in both go.mod files. `go mod tidy`
in workspace mode drops it, which breaks the Docker build where no
workspace exists.

.gitea/workflows/server-deploy.yml

@@ -24,7 +24,8 @@ jobs:
             - name: Build and push server image
               run: |
                   IMAGE="${{ vars.DOCKER_HOST }}/${{ github.repository_owner }}/vantage/server:latest"
-                  docker build -t "$IMAGE" -f server/Dockerfile server/
+                  # Root context: server depends on the shared module.
+                  docker build -t "$IMAGE" -f server/Dockerfile .
                   docker push "$IMAGE"
 
             - name: Build and push web image
@@ -49,5 +50,6 @@ jobs:
             - name: Build and push sitesvc image
               run: |
                   IMAGE="${{ vars.DOCKER_HOST }}/${{ github.repository_owner }}/vantage/sitesvc:latest"
-                  docker build -t "$IMAGE" -f sitesvc/Dockerfile sitesvc/
+                  # Root context: sitesvc depends on the shared module.
+                  docker build -t "$IMAGE" -f sitesvc/Dockerfile .
                   docker push "$IMAGE"

server/Dockerfile

@@ -1,17 +1,22 @@
 # Build stage
+#
+# Context is the repository root, not server/, because server depends on the
+# shared module through a replace directive.
 FROM golang:1.26 AS builder
 
-WORKDIR /app
+WORKDIR /src
 
-# Download dependencies first (layer cache)
-COPY go.mod go.sum ./
-RUN go mod download
+# Manifests first so the dependency layer caches independently of source edits.
+COPY shared/go.mod shared/go.sum ./shared/
+COPY server/go.mod server/go.sum ./server/
+RUN cd server && go mod download
 
-# Copy source and build
-COPY . .
+COPY shared/ ./shared/
+COPY server/ ./server/
 
 ARG VERSION=dev
-RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w -X main.Version=${VERSION}" -o /vantage-server ./cmd
+RUN cd server && CGO_ENABLED=0 GOOS=linux go build \
+      -ldflags="-s -w -X main.Version=${VERSION}" -o /vantage-server ./cmd
 
 # Runtime stage
 FROM scratch

server/go.mod

@@ -36,6 +36,7 @@ require (
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/mrhid6/vantage/shared v0.0.0
 	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
 	github.com/sirupsen/logrus v1.4.2 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect

sitesvc/Dockerfile

@@ -1,13 +1,16 @@
+# Context is the repository root; sitesvc depends on the shared module.
 FROM golang:1.26-alpine AS builder
 
-WORKDIR /app
+WORKDIR /src
 
-COPY go.mod go.sum ./
-RUN go mod download
+COPY shared/go.mod shared/go.sum ./shared/
+COPY sitesvc/go.mod sitesvc/go.sum ./sitesvc/
+RUN cd sitesvc && go mod download
 
-COPY . .
+COPY shared/ ./shared/
+COPY sitesvc/ ./sitesvc/
 
-RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /out/sitesvc ./cmd
+RUN cd sitesvc && CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /out/sitesvc ./cmd
 
 FROM alpine:3.20 AS runner
 

sitesvc/go.mod

@@ -11,6 +11,7 @@ require (
 
 require (
 	github.com/klauspost/compress v1.17.6 // indirect
+	github.com/mrhid6/vantage/shared v0.0.0
 	github.com/xdg-go/pbkdf2 v1.0.0 // indirect
 	github.com/xdg-go/scram v1.2.0 // indirect
 	github.com/xdg-go/stringprep v1.0.4 // indirect