Adds warning for running podman on Apple Silicon (redhat-developer#5629)

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**What type of PR is this:**

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/kind feature

**What does this PR do / why we need it:**

Warns the user if we are trying to run Podman on Mac M1. As we are
unable to build x86 images natively unless using the workaround.

**Which issue(s) this PR fixes:**
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Fixes redhat-developer#5597

**PR acceptance criteria:**

- [X] Unit test

- [X] Integration test

- [X] Documentation

**How to test changes / Special notes to the reviewer:**

Run it on a M1 mac :)

Signed-off-by: Charlie Drage <[email protected]>

pkg/devfile/image/image.go

@@ -95,6 +95,21 @@ func selectBackend() (Backend, error) {
 		podmanCmd = "podman"
 	}
 	if _, err := lookPathCmd(podmanCmd); err == nil {
+
+		// Podman does NOT build x86 images on Apple Silicon / M1 and we must *WARN* the user that this will not work.
+		// There is a temporary workaround in order to build x86 images on Apple Silicon / M1 by running the following commands:
+		// podman machine ssh sudo rpm-ostree install qemu-user-static
+		// podman machine ssh sudo systemctl reboot
+		//
+		// The problem is that Fedora CoreOS does not have qemu-user-static installed by default,
+		// and the workaround is to install it manually as the dependencies need to be integrated into the Fedora ecosystem
+		// The open discussion is here: https://github.com/containers/podman/discussions/12899
+		//
+		// TODO: Remove this warning when Podman natively supports x86 images on Apple Silicon / M1.
+		if log.IsAppleSilicon() {
+			log.Warning("WARNING: Building images on Apple Silicon / M1 is not (yet) supported natively on Podman")
+			log.Warning("There is however a temporary workaround: https://github.com/containers/podman/discussions/12899")
+		}
 		return NewDockerCompatibleBackend(podmanCmd), nil
 	}
 

pkg/log/status.go

@@ -484,6 +484,11 @@ func IsDebug() bool {
 	return false
 }
 
+// IsAppleSilicon returns true if we are on a Mac M1 / Apple Silicon natively
+func IsAppleSilicon() bool {
+	return runtime.GOOS == "darwin" && (strings.HasPrefix(runtime.GOARCH, "arm") || strings.HasPrefix(runtime.GOARCH, "arm64"))
+}
+
 // GetStdout gets the appropriate stdout from the OS. If it's Linux, it will use
 // the go-colorable library in order to fix any and all color ASCII issues.
 // TODO: Test needs to be added once we get Windows testing available on TravisCI / CI platform.