auto-detect build runtime arch

If the user hasn't explictyly set GOARCH, don't default to amd64. This
way, a user has to expliciltly cross-compile, instead of needing to know
to set GOARCH on build for a native arch that isn't amd64.

Signed-off-by: Christy Norman <christy@linux.vnet.ibm.com>

Author: clnperez

CHANGELOG.md

@@ -17,6 +17,7 @@
 
 ### Bug Fixes
 - Fix issue faced in the Ansible based operators when `jmespath` queries are used because it was not installed. ([#2252](https://github.com/operator-framework/operator-sdk/pull/2252))
+- Fix issue building on non-x86/AMD architectures where, if not explicitily overriden, users could end up with an AMD binary inside an image of a different architecture. ([#2268](https://github.com/operator-framework/operator-sdk/pull/2268))
 
 ## v0.12.0
 

cmd/operator-sdk/build/cmd.go

@@ -91,12 +91,6 @@ func buildFunc(cmd *cobra.Command, args []string) error {
 	projutil.MustInProjectRoot()
 	goBuildEnv := append(os.Environ(), "GOOS=linux")
 
-	if value, ok := os.LookupEnv("GOARCH"); ok {
-		goBuildEnv = append(goBuildEnv, "GOARCH="+value)
-	} else {
-		goBuildEnv = append(goBuildEnv, "GOARCH=amd64")
-	}
-
 	// If CGO_ENABLED is not set, set it to '0'.
 	if _, ok := os.LookupEnv("CGO_ENABLED"); !ok {
 		goBuildEnv = append(goBuildEnv, "CGO_ENABLED=0")