Dockerfile, Makefile: make CGO_ENABLED configurable (#1382)

The commit
a107703 ("feat(fips): enable GO_ENABLED in build (#1001)")

enabled CGO which makes problems for builders on non-x86 platforms.

Make it as an in the Dockerfile keeping default the same (enabled),
but make it possible to override with either environment
(`export CGO_ENABLED=0`) or make (`make CGO_ENABLED=0 image-build`)

Signed-off-by: Yauheni Kaliuta <ykaliuta@redhat.com>

Dockerfiles/Dockerfile

@@ -22,6 +22,7 @@ COPY opt/manifests/ /opt/manifests/
 
 ################################################################################
 FROM builder_local_${USE_LOCAL} as builder
+ARG CGO_ENABLED=1
 USER root
 WORKDIR /workspace
 # Copy the Go Modules manifests
@@ -39,7 +40,7 @@ COPY main.go main.go
 COPY pkg/ pkg/
 
 # Build
-RUN CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build -a -o manager main.go
+RUN CGO_ENABLED=${CGO_ENABLED} GOOS=linux GOARCH=amd64 go build -a -o manager main.go
 
 ################################################################################
 FROM registry.access.redhat.com/ubi8/ubi-minimal:latest

Makefile

@@ -22,7 +22,7 @@ BUNDLE_IMG ?= $(IMAGE_TAG_BASE)-bundle:v$(VERSION)
 IMAGE_BUILDER ?= podman
 OPERATOR_NAMESPACE ?= opendatahub-operator-system
 DEFAULT_MANIFESTS_PATH ?= opt/manifests
-
+CGO_ENABLED ?= 1
 
 CHANNELS="fast"
 # CHANNELS define the bundle channels used in the bundle.
@@ -94,6 +94,7 @@ E2E_TEST_FLAGS = "--skip-deletion=false" -timeout 25m # See README.md, default g
 # set to "true" to use local instead
 # see target "image-build"
 IMAGE_BUILD_FLAGS ?= --build-arg USE_LOCAL=false
+IMAGE_BUILD_FLAGS += --build-arg CGO_ENABLED=$(CGO_ENABLED)
 
 # Read any custom variables overrides from a local.mk file.  This will only be read if it exists in the
 # same directory as this Makefile.  Variables can be specified in the standard format supported by