Simpler Dockerfile

Signed-off-by: David Gageot <david.gageot@docker.com>

Dockerfile

@@ -3,13 +3,9 @@
 # xx is a helper for cross-compilation
 FROM --platform=$BUILDPLATFORM tonistiigi/xx:1.7.0 AS xx
 
-FROM --platform=$BUILDPLATFORM golang:1.25.0-alpine3.22 AS base
-RUN apk add clang file
+FROM --platform=$BUILDPLATFORM golang:1.25.0-alpine3.22 AS builder-base
 COPY --from=xx / /
-ENV CGO_ENABLED=0
 WORKDIR /src
-
-FROM base AS builder-base
 RUN --mount=type=cache,target=/go/pkg/mod \
     --mount=type=bind,source=go.mod,target=go.mod \
     --mount=type=bind,source=go.sum,target=go.sum \
@@ -30,7 +26,6 @@ RUN --mount=type=cache,target=/root/.cache,id=docker-ai-$TARGETPLATFORM \
     --mount=type=secret,id=telemetry_header,env=TELEMETRY_HEADER <<EOT
     set -ex
     xx-go build -trimpath -ldflags "-s -w -X 'github.com/docker/cagent/pkg/version.Version=$GIT_TAG' -X 'github.com/docker/cagent/pkg/version.Commit=$GIT_COMMIT' -X 'github.com/docker/cagent/pkg/version.BuildTime=$BUILD_DATE' -X 'github.com/docker/cagent/pkg/telemetry.TelemetryEndpoint=$TELEMETRY_ENDPOINT' -X 'github.com/docker/cagent/pkg/telemetry.TelemetryAPIKey=$TELEMETRY_API_KEY' -X 'github.com/docker/cagent/pkg/telemetry.TelemetryHeader=$TELEMETRY_HEADER'" -o /binaries/cagent-$TARGETOS-$TARGETARCH .
-    file /binaries/cagent-$TARGETos-$TARGETARCH
     xx-verify --static /binaries/cagent-$TARGETOS-$TARGETARCH
     if [ "$TARGETOS" = "windows" ]; then
       mv /binaries/cagent-$TARGETOS-$TARGETARCH /binaries/cagent-$TARGETOS-$TARGETARCH.exe