rootfs: Don't hardcode alpine version for golang images
Remove the version of alpine used when pulling golang docker images.
This ensures the latest version of alpine is used and resolves the
maintenance issue when old versions of alpine are dropped.
Fixes:
#
# SPDX-License-Identifier: Apache-2.0
-From golang:@GO_VERSION@-alpine3.7
+From golang:@GO_VERSION@-alpine
RUN apk update && apk add git make bash gcc musl-dev linux-headers apk-tools-static libseccomp libseccomp-dev
