Only use podman if CLI can execute. Use docker if non-Linux podman ha…

…s no connection to Linux system.

Solves
```
❯ make test
Cannot connect to Podman. Please verify your connection to the Linux system using `podman system connection list`, or try `podman machine init` and `podman machine start` to manage a new Linux VM Error: unable to connect to Podman socket: failed to read identity "/Users/tiger/.local/share/containers/podman/machine/machine": open /Users/tiger/.local/share/containers/podman/machine/machine: no such file or directory /opt/homebrew/bin/docker run --rm -e LDFLAGS=" -X main.GitCommit=bbdd974+CHANGES -X main.GitDescribe=v4 -w -s" -e GITHUB_TOKEN="" -v /Users/tiger/git/yq-k8s/vendor:/go/src -v /Users/tiger/git/yq-k8s:/yq/src/github.com/mikefarah/yq -w /yq/src/github.com/mikefarah/yq yq_dev go mod vendor
Error: podman-machine-default: VM already exists
```

Signed-off-by: Tiger Kaovilai <[email protected]>

Makefile

@@ -2,7 +2,7 @@ MAKEFLAGS += --warn-undefined-variables
 SHELL := /bin/bash
 .SHELLFLAGS := -o pipefail -euc
 .DEFAULT_GOAL := install
-ENGINE := $(shell { command -v podman || command -v docker; } 2>/dev/null)
+ENGINE := $(shell { (podman version > /dev/null 2>&1 && command -v podman) || command -v docker; } 2>/dev/null)
 
 include Makefile.variables