🔧 Add Go default env flags to build and final stages 🔧

- Dockerfile: add GOFLAGS=-buildvcs=false to prevent VCS stamp errors when
users mount projects without a .git directory (Go 1.18+ default behaviour)
- Dockerfile: add GOTELEMETRY=off to disable Go 1.23+ telemetry in containers
- Dockerfile: add GOPROXY=https://proxy.golang.org,direct (explicit default,
makes override via --env obvious)
- Dockerfile: add GOBIN=/usr/local/bin to the final stage — was set in the
build stage but missing from the scratch-based final stage; without it,
go install inside the running container lands binaries in /usr/local/share/go/bin
instead of /usr/local/bin

Dockerfile

Dockerfile

@@ -88,6 +88,9 @@ ENV GOBIN="/usr/local/bin"
 ENV GOCACHE="/usr/local/share/go/cache"
 ENV CGO_ENABLED="0"
 ENV GOTOOLCHAIN="auto"
+ENV GOFLAGS="-buildvcs=false"
+ENV GOTELEMETRY="off"
+ENV GOPROXY="https://proxy.golang.org,direct"
 
 USER ${USER}
 WORKDIR /root
@@ -272,9 +275,13 @@ ENV PHP_VERSION="${PHP_VERSION}"
 ENV DISTRO_VERSION="${IMAGE_VERSION}"
 ENV WWW_ROOT_DIR="${WWW_ROOT_DIR}"
 ENV GOPATH="/usr/local/share/go"
+ENV GOBIN="/usr/local/bin"
 ENV GOCACHE="/usr/local/share/go/cache"
 ENV CGO_ENABLED="0"
 ENV GOTOOLCHAIN="auto"
+ENV GOFLAGS="-buildvcs=false"
+ENV GOTELEMETRY="off"
+ENV GOPROXY="https://proxy.golang.org,direct"
 
 COPY --from=build /. /