`make` fails if docker is not installed and running about container-canary HOT 2 CLOSED

$ docker run --rm -it golang bash  # Jump into a container that doesn't have `docker`

$ git clone https://github.com/NVIDIA/container-canary.git /usr/local/src

$ cd /usr/local/src

$ make
go test -v ./...
?       github.com/nvidia/container-canary      [no test files]
=== RUN   TestRoot
--- PASS: TestRoot (0.00s)
=== RUN   TestValidate
    validate_test.go:35:
                Error Trace:    validate_test.go:35
                Error:          Expected nil, but got: &errors.errorString{s:"no such image: container-canary/kubeflow:shouldpass"}
                Test:           TestValidate
                Messages:       should not error
    validate_test.go:36:
                Error Trace:    validate_test.go:36
                Error:          "Cannot find container-canary/kubeflow:shouldpass, pulling..." does not contain "Validating container-canary/kubeflow:shouldpass against kubeflow"
                Test:           TestValidate
                Messages:       did not validate
    validate_test.go:37:
                Error Trace:    validate_test.go:37
                Error:          "Cannot find container-canary/kubeflow:shouldpass, pulling..." does not contain "validation passed"
                Test:           TestValidate
                Messages:       did not pass
--- FAIL: TestValidate (0.00s)
=== RUN   TestValidateFails
    validate_test.go:49:
                Error Trace:    validate_test.go:49
                Error:          "Cannot find container-canary/kubeflow:shouldfail, pulling..." does not contain "validation failed"
                Test:           TestValidateFails
                Messages:       did not fail
--- FAIL: TestValidateFails (0.00s)
=== RUN   TestFileDoesNotExist
--- PASS: TestFileDoesNotExist (0.00s)
=== RUN   TestVersion
Container Canary
--- PASS: TestVersion (0.00s)
FAIL
FAIL    github.com/nvidia/container-canary/cmd  0.012s
?       github.com/nvidia/container-canary/internal     [no test files]
?       github.com/nvidia/container-canary/internal/apis/v1     [no test files]
=== RUN   TestValidator
--- PASS: TestValidator (0.00s)
PASS
ok      github.com/nvidia/container-canary/internal/config      0.035s
=== RUN   TestDockerContainer
    docker_test.go:45: Failed to start container: exec: "docker": executable file not found in $PATH
    docker_test.go:50: Failed to inspect container: exec: "docker": executable file not found in $PATH
--- FAIL: TestDockerContainer (0.00s)
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
        panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x28 pc=0xaad1b5]

goroutine 7 [running]:
testing.tRunner.func1.2({0xb22f00, 0x113e3e0})
        /usr/local/go/src/testing/testing.go:1389 +0x24e
testing.tRunner.func1()
        /usr/local/go/src/testing/testing.go:1392 +0x39f
panic({0xb22f00, 0x113e3e0})
        /usr/local/go/src/runtime/panic.go:838 +0x207
github.com/nvidia/container-canary/internal/container.TestDockerContainer(0xc0001fa680)
        /usr/local/src/internal/container/docker_test.go:52 +0x295
testing.tRunner(0xc0001fa680, 0xc49850)
        /usr/local/go/src/testing/testing.go:1439 +0x102
created by testing.(*T).Run
        /usr/local/go/src/testing/testing.go:1486 +0x35f
FAIL    github.com/nvidia/container-canary/internal/container   0.007s
?       github.com/nvidia/container-canary/internal/validator   [no test files]
FAIL
make: *** [Makefile:30: test] Error 1