Update the example Flyte agent Dockerfile #3525

Job	Run time
unpack-envvars	1s
flyteadmin integration tests image / build_docker	2m 49s
Build Images / Build & Push Image (datacatalog) / Push to Github Registry	4m 5s
Build Images / Build & Push Image (flyteadmin) / Push to Github Registry	5m 40s
Build Images / Build & Push Image (flytecopilot) / Push to Github Registry	4m 1s
Build Images / Build & Push Image (flytepropeller) / Push to Github Registry	24s
Build Images / Build & Push Image (flytescheduler) / Push to Github Registry	5m 15s
Dry Run Goreleaser	7m 41s
Test Getting started	5m 47s
Check Go Generate (datacatalog) / Go Generate	1m 23s
Check Go Generate (flyteadmin) / Go Generate	2m 6s
Check Go Generate (flytecopilot) / Go Generate	1m 22s
Check Go Generate (flytectl) / Go Generate	2m 2s
Check Go Generate (flytepropeller) / Go Generate	2m 4s
Lint (datacatalog) / Run Lint	2m 14s
Lint (flyteadmin) / Run Lint	2m 57s
Lint (flytectl) / Run Lint	2m 31s
Lint (flyteidl) / Run Lint	1m 51s
Lint (flyteplugins) / Run Lint	2m 51s
Lint (flytepropeller) / Run Lint	4m 6s
Lint (flytestdlib) / Run Lint	2m 24s
Unit Tests (datacatalog) / Run Unit Test	2m 57s
Unit Tests (flytecopilot) / Run Unit Test	2m 44s
Unit Tests (flyteadmin) / Run Unit Test	4m 27s
Unit Tests (flytectl) / Run Unit Test	2m 53s
Unit Tests (flyteplugins) / Run Unit Test	3m 26s
Unit Tests (flytepropeller) / Run Unit Test	4m 22s
Unit Tests (flytestdlib) / Run Unit Test	3m 15s
Integration Test (flyteadmin) / Integration tests	6m 2s
	1h 33m 40s

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