fix env var from host truncated at equal sign

[thomasten]

• first commit improves debugging with gdb by disabling some Go optimizations
• second commit fixes the bug where an env var from host like FOO=bar=baz was truncated to the value bar

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[daniel-weisse]

Suggested change

	splitString := strings.SplitN(envVar, "=", 2)
	hostEnvironMap[splitString[0]] = splitString[1]
	envName, envValue, _ := strings.Cut(envVar, "=")
	hostEnvironMap[envName] = envValue

The Go docs recommend using Cut if splitting around the first instance of a separator.
There shouldn't be any functional difference though