Add support to generate aarch64 bits for Linux

This pr adds linux arm64 target to makefile and also make change to spec
file to generate right package for arm64.

Makefile

@@ -106,6 +106,9 @@ $(BUILD_DIR)/macos-arm64/crc: $(SOURCES)
 $(BUILD_DIR)/linux-amd64/crc: $(SOURCES)
 	GOOS=linux GOARCH=amd64 go build -tags "$(BUILDTAGS)" -ldflags="$(LDFLAGS)" -o $@ $(GO_EXTRA_BUILDFLAGS) ./cmd/crc
 
+$(BUILD_DIR)/linux-arm64/crc: $(SOURCES)
+	GOOS=linux GOARCH=arm64 go build -tags "$(BUILDTAGS)" -ldflags="$(LDFLAGS)" -o $@ $(GO_EXTRA_BUILDFLAGS) ./cmd/crc
+
 $(BUILD_DIR)/windows-amd64/crc.exe: $(SOURCES)
 	GOARCH=amd64 GOOS=windows go build -tags "$(BUILDTAGS)" -ldflags="$(LDFLAGS)" -o $@ $(GO_EXTRA_BUILDFLAGS) ./cmd/crc
 

packaging/rpm/crc.spec.in

@@ -19,6 +19,12 @@ CRC's main executable}
 %global golicenses    LICENSE
 %global godocs        *.md
 
+%ifarch x86_64
+%global gohostarch  amd64
+%endif
+%ifarch aarch64
+%global gohostarch  arm64
+%endif
 
 Name:           %{goname}
 Release:        1%{?dist}
@@ -65,7 +71,7 @@ make COMMIT_SHA=__COMMIT_SHA__ GO_EXTRA_LDFLAGS="-B 0x$(head -c20 /dev/urandom|o
 %install
 # with fedora macros: gopkginstall
 install -m 0755 -vd                     %{buildroot}%{_bindir}
-install -m 0755 -vp %{gobuilddir}/src/%{goipath}/out/linux-amd64/crc %{buildroot}%{_bindir}/
+install -m 0755 -vp %{gobuilddir}/src/%{goipath}/out/linux-%{gohostarch}/crc %{buildroot}%{_bindir}/
 
 install -d %{buildroot}%{_datadir}/%{name}-redistributable/{linux,macos,windows}
 install -m 0755 -vp %{gobuilddir}/src/%{goipath}/release/* %{buildroot}%{_datadir}/%{name}-redistributable/linux/

pkg/crc/preflight/preflight_checks_unix.go

@@ -139,9 +139,18 @@ func fixAdminHelperExecutableCached() error {
 
 func checkSupportedCPUArch() error {
 	logging.Debugf("GOARCH is %s GOOS is %s", runtime.GOARCH, runtime.GOOS)
-	// Only supported arches are amd64, and arm64 on macOS
-	if runtime.GOARCH == "amd64" || (runtime.GOARCH == "arm64" && runtime.GOOS == "darwin") {
+	// Only supported arches are amd64, and arm64 on macOS & Linux
+	switch runtime.GOARCH {
+	case "amd64":
 		return nil
+	case "arm64":
+		if runtime.GOOS == "darwin" {
+			return nil
+		}
+		if runtime.GOOS == "linux" {
+			logging.Warnf("CRC is not officially supported on ARM64 CPUs for Linux.")
+			return nil
+		}
 	}
 	return fmt.Errorf("CRC can only run on AMD64/Intel64 CPUs and Apple silicon")
 }