fix: ARM images (openshift#55)

Signed-off-by: Mateus Oliveira <[email protected]>

Dockerfile.ubi

@@ -1,9 +1,14 @@
 FROM quay.io/konveyor/builder:ubi9-latest AS builder
+ARG TARGETOS
+ARG TARGETARCH
+
 ENV GOPATH=$APP_ROOT
+
 COPY . $APP_ROOT/src/velero-plugin-for-aws
+
 WORKDIR $APP_ROOT/src/velero-plugin-for-aws
-RUN CGO_ENABLED=0 GOOS=linux go build -v -o $APP_ROOT/bin/velero-plugin-for-aws -mod=mod ./velero-plugin-for-aws
 
+RUN CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} go build -v -o $APP_ROOT/bin/velero-plugin-for-aws -mod=mod ./velero-plugin-for-aws
 
 FROM registry.access.redhat.com/ubi9-minimal
 RUN mkdir /plugins