dockerfile: pin gcc base image to version 13

Author: Raghavendra K

Dockerfile

@@ -1,18 +1,6 @@
-# === Stage 1: Build DRBD utilities ===
 FROM --platform=$TARGETPLATFORM gcc:13 as utils-builder
 
-# Install only necessary tools in minimal environment
-# - flex: needed for parsing in DRBD utils build
-# - libkeyutils-dev: required by DRBD
-# - curl, tar: to fetch and extract source
-# - make: to compile tools
-RUN apt-get update && apt-get install -y \
-    flex \
-    libkeyutils-dev \
-    curl \
-    tar \
-    make \
- && apt-get clean
+RUN apt-get update && apt-get install -y flex libkeyutils-dev
 
 ARG DRBD_UTILS_VERSION=9.27.0
 RUN curl -fsSL "https://pkg.linbit.com/downloads/drbd/utils/drbd-utils-$DRBD_UTILS_VERSION.tar.gz" | tar -xzv \
@@ -21,11 +9,11 @@ RUN curl -fsSL "https://pkg.linbit.com/downloads/drbd/utils/drbd-utils-$DRBD_UTI
     && make tools \
     && mv user/v9/drbdsetup /drbdsetup
 
-# === Stage 2: Build Go binary ===
 FROM --platform=$BUILDPLATFORM golang:1 as go-builder
 
 WORKDIR /work
 COPY go.mod go.sum /work/
+
 RUN go mod download -x
 
 COPY main.go main.go
@@ -34,19 +22,12 @@ COPY pkg/ pkg/
 ARG VERSION=devel
 ARG TARGETARCH
 ARG TARGETOS
-RUN --mount=type=cache,target=/root/.cache/go-build \
-    CGO_ENABLED=0 \
-    GOOS=$TARGETOS \
-    GOARCH=$TARGETARCH \
-    go build -a -ldflags "-X github.com/piraeusdatastore/drbd-shutdown-guard/pkg/vars.Version=$VERSION" -o drbd-shutdown-guard main.go
+RUN --mount=type=cache,target=/root/.cache/go-build CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH go build -a -ldflags "-X github.com/piraeusdatastore/drbd-shutdown-guard/pkg/vars.Version=$VERSION" -o drbd-shutdown-guard main.go
 
-# === Stage 3: Final minimal runtime image ===
-FROM registry.access.redhat.com/ubi9/ubi-minimal:latest
+FROM --platform=$TARGETPLATFORM registry.access.redhat.com/ubi9/ubi:latest
 
-# Copy only the built binaries from previous stages
 COPY --from=utils-builder /drbdsetup /usr/local/sbin/drbdsetup
 COPY --from=go-builder /work/drbd-shutdown-guard /usr/local/sbin/drbd-shutdown-guard
 
-# Define the binary to run
 ENV DRBDSETUP_LOCATION=/usr/local/sbin/drbdsetup
 CMD ["/usr/local/sbin/drbd-shutdown-guard", "install"]