Eager loading of .env files and overwrite #962

Job	Run time
build	1m 47s
Julia 1.6 - ubuntu-latest - x64	4m 1s
Julia 1.6 - macOS-latest - x64	10m 52s
Julia 1.6 - windows-latest - x64	15m 10s
Julia 1 - ubuntu-latest - x64	3m 35s
Julia 1 - macOS-latest - x64	5m 37s
Julia 1 - windows-latest - x64	4m 54s
Julia nightly - ubuntu-latest - x64	5m 25s
Julia nightly - macOS-latest - x64	11m 0s
Julia nightly - windows-latest - x64	7m 11s
	1h 9m 32s

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