tests

Use MIGRATION_DIR environment variable (#2419) #4524

Job	Run time
Init	4s
Rustfmt	19s
Clippy	1m 18s
Unit Test	2m 50s
Examples (examples/actix_example)	2m 7s
Examples (examples/axum_example)	1m 49s
Examples (examples/basic)	1m 30s
Examples (examples/graphql_example)	1m 2s
Examples (examples/jsonrpsee_example)	59s
Examples (examples/loco_example)	57s
Examples (examples/loco_starter)	52s
Examples (examples/loco_seaography)	53s
Examples (examples/poem_example)	51s
Examples (examples/proxy_gluesql_example)	37s
Examples (examples/react_admin)	35s
Examples (examples/rocket_example)	20s
Examples (examples/rocket_okapi_example)	22s
Examples (examples/salvo_example)	19s
Examples (examples/seaography_example)	29s
Examples (examples/tonic_example)	5s
Compile MySQL (actix, native-tls)	1s
Compile SQLite (async-std, native-tls)	1s
CLI	0s
Compile MySQL (actix, rustls)	1s
Compile SQLite (async-std, rustls)	1s
Compile PostgreSQL (tokio, native-tls)	1s
Compile PostgreSQL (tokio, rustls)	1s
Issues Matrix	0s
Issues	0s
SQLite	1s
MySQL	1s
MariaDB	1s
Postgres	1s
	18m 28s

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