K8SPSMDB-948: Multi arch build

An easy way to build PSMDB for different architectures.

Signed-off-by: Serge Logvinov <serge.logvinov@sinextra.dev>

build/Dockerfile

@@ -3,11 +3,13 @@ WORKDIR /go/src/github.com/percona/percona-server-mongodb-operator
 
 COPY . .
 
+ARG TARGETARCH
+
 ARG GIT_COMMIT
 ARG GIT_BRANCH
 ARG GO_LDFLAGS
 ARG GOOS=linux
-ARG GOARCH=amd64
+ARG GOARCH=${TARGETARCH}
 ARG CGO_ENABLED=0
 
 RUN go mod download \

e2e-tests/build

@@ -14,6 +14,11 @@ fi
 if [[ ${DOCKER_SQUASH:-1} == 1 ]]; then
 	squash="--squash"
 fi
+if [[ ${DOCKER_PUSH:-1} == 1 ]]; then
+	imgresult="--push=true"
+else
+	imgresult="--output type=docker"
+fi
 
 build_operator() {
 	if [ "${RELEASE:-1}" = 0 ]; then
@@ -24,18 +29,16 @@ build_operator() {
 	export DOCKER_DEFAULT_PLATFORM=${DOCKER_DEFAULT_PLATFORM:-linux/amd64}
 	export GO_LDFLAGS="-w -s -trimpath $GO_LDFLAGS"
 	pushd ${src_dir}
-	docker build \
+	docker buildx build \
+		--platform $DOCKER_DEFAULT_PLATFORM \
 		--build-arg GIT_COMMIT=$GIT_COMMIT \
 		--build-arg GIT_BRANCH=$GIT_BRANCH \
 		--build-arg GO_LDFLAGS="$GO_LDFLAGS" \
 		$squash \
 		$no_cache \
+		$imgresult \
 		-t "${IMAGE}" -f build/Dockerfile .
 	popd
-
-	if [ "${DOCKER_PUSH:-1}" = 1 ]; then
-		docker push ${IMAGE}
-	fi
 }
 
 until docker ps; do sleep 1; done