Add flytectl install script #54

Job	Run time
unpack-envvars	1s
flyteadmin integration tests image / build_docker	2m 54s
Build Images / Build & Push Image (datacatalog) / Push to Github Registry	3m 14s
Build Images / Build & Push Image (flyteadmin) / Push to Github Registry	3m 14s
Build Images / Build & Push Image (flytecopilot) / Push to Github Registry	3m 15s
Build Images / Build & Push Image (flytescheduler) / Push to Github Registry	3m 14s
Build Images / Build & Push Image (flytepropeller) / Push to Github Registry	25s
Dry Run Goreleaser	3m 3s
Test Getting started	3m 12s
Lint (datacatalog) / Run Lint	2m 2s
Lint (flyteadmin) / Run Lint	2m 33s
Lint (flytectl) / Run Lint	1m 42s
Lint (flyteidl) / Run Lint	1m 26s
Lint (flyteplugins) / Run Lint	2m 35s
Lint (flytepropeller) / Run Lint	2m 34s
Lint (flytestdlib) / Run Lint	2m 12s
Check Go Generate (datacatalog) / Go Generate	8s
Check Go Generate (flyteadmin) / Go Generate	6s
Check Go Generate (flytecopilot) / Go Generate	7s
Check Go Generate (flytectl) / Go Generate	5s
Check Go Generate (flytepropeller) / Go Generate	9s
Unit Tests (datacatalog) / Run Unit Test	1m 49s
Unit Tests (flyteadmin) / Run Unit Test	1m 45s
Unit Tests (flytecopilot) / Run Unit Test	1m 33s
Unit Tests (flytectl) / Run Unit Test	1m 28s
Unit Tests (flyteplugins) / Run Unit Test	54s
Unit Tests (flytepropeller) / Run Unit Test	1m 22s
Unit Tests (flytestdlib) / Run Unit Test	1m 1s
Integration Test (flyteadmin) / Integration tests	9s
	48m 12s

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