Add armv7 support

This allows the nfd to run on arm devices like the Raspberry Pi > 2
with armv7 core or armv8 in 32Bit mode.

The build tests will only be run for linux/amd64 and linux/arm64.
Releases will be made for all Platforms.

Author: Links2004

Makefile

@@ -63,7 +63,7 @@ BUILD_FLAGS = -tags osusergo,netgo \
               -ldflags "-s -w -extldflags=-static -X sigs.k8s.io/node-feature-discovery/pkg/version.version=$(VERSION) -X sigs.k8s.io/node-feature-discovery/pkg/utils/hostpath.pathPrefix=$(HOSTMOUNT_PREFIX)"
 
 # multi-arch build with buildx
-IMAGE_ALL_PLATFORMS ?= linux/amd64,linux/arm64
+IMAGE_ALL_PLATFORMS ?= linux/amd64,linux/arm64,linux/arm/v7
 
 # enable buildx
 ensure-buildx:

scripts/test-infra/build-image-cross.sh

@@ -1,4 +1,4 @@
 #!/bin/bash -e
 
 # cross build
-make image-all
+IMAGE_ALL_PLATFORMS=linux/amd64,linux/arm64 make image-all