Update Go tooling and fix path

Signed-off-by: Marcus Noble <github@marcusnoble.co.uk>

Dockerfile

@@ -3,14 +3,17 @@ FROM debian:bookworm-slim AS base
 ENV DEBIAN_FRONTEND=noninteractive
 ENV LANG=C.UTF-8
 ENV LC_ALL=C.UTF-8
+ARG TARGETARCH=amd64
 
 # ─── Common CLI tools ───────────────────────────────────────────
 RUN apt-get update && apt-get install -y --no-install-recommends \
         ca-certificates \
         curl \
+        gcc \
         git \
         jq \
         less \
+        make \
         openssh-client \
         procps \
         sudo \
@@ -39,7 +42,7 @@ RUN curl -fsSL https://deb.nodesource.com/setup_22.x | bash - && \
 
 # ─── Go 1.26 ────────────────────────────────────────────────────
 ARG GO_VERSION=1.26.8
-ARG TARGETARCH=amd64
+ARG GOLANG_LINT_VERSION=v2.14.0
 RUN case "$TARGETARCH" in \
         amd64|arm64) GOOS="linux"; GOARCH="$TARGETARCH" ;; \
         *)           GOOS="linux"; GOARCH="amd64"  ;; \
@@ -50,6 +53,9 @@ RUN case "$TARGETARCH" in \
     rm /tmp/go.tar.gz
 ENV PATH="/usr/local/go/bin:/root/go/bin:/usr/local/bin:${PATH}"
 RUN go version
+RUN go install golang.org/x/tools/cmd/goimports@latest && \
+    go install honnef.co/go/tools/cmd/staticcheck@latest && \
+    curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/${GOLANG_LINT_VERSION}/install.sh | sh -s -- -b /root/go/bin ${GOLANG_LINT_VERSION}
 
 # ─── Docker CLI ──────────────────────────────────────────────────
 ARG DOCKER_CLI_VERSION=29.8.1
@@ -69,3 +75,6 @@ RUN case "$TARGETARCH" in \
 RUN rm -rf /var/lib/apt/lists/* \
     /tmp/* \
     /var/tmp/*
+
+# ─── Persist Go on PATH after /etc/profile resets it ────────────
+RUN printf 'export PATH="/usr/local/go/bin:/root/go/bin:/usr/local/bin:$PATH"\n' > /etc/profile.d/go.sh