Run tests for Ruby 3.1 and change from racer to mini_racer for Ruby 3.1 support

test-envs/docker-compose-3.0-mysql.yml

@@ -10,7 +10,7 @@ services:
   web:
     build:
       context: ..
-      dockerfile: Dockerfile-3.0
+      dockerfile: Dockerfile
     environment:
       # These are set in script/ci-build, so we need to pass-thru them.
       RAILS_ENV: $RAILS_ENV

test-envs/docker-compose-3.0-postgres.yml

@@ -10,7 +10,7 @@ services:
   web:
     build:
       context: ..
-      dockerfile: Dockerfile-3.0
+      dockerfile: Dockerfile
     environment:
       # These are set in script/ci-build, so we need to pass-thru them.
       RAILS_ENV: $RAILS_ENV

test-envs/docker-compose-3.0-sqlite.yml

@@ -3,7 +3,7 @@ services:
   web:
     build:
       context: ..
-      dockerfile: Dockerfile-3.0
+      dockerfile: Dockerfile
     environment:
       # These are set in script/ci-build, so we need to pass-thru them.
       RAILS_ENV: $RAILS_ENV

test-envs/docker-compose-3.1-mysql.yml

@@ -10,7 +10,7 @@ services:
   web:
     build:
       context: ..
-      dockerfile: Dockerfile
+      dockerfile: Dockerfile-3.1
     environment:
       # These are set in script/ci-build, so we need to pass-thru them.
       RAILS_ENV: $RAILS_ENV

test-envs/docker-compose-3.1-postgres.yml

@@ -10,7 +10,7 @@ services:
   web:
     build:
       context: ..
-      dockerfile: Dockerfile
+      dockerfile: Dockerfile-3.1
     environment:
       # These are set in script/ci-build, so we need to pass-thru them.
       RAILS_ENV: $RAILS_ENV

test-envs/docker-compose-3.1-sqlite.yml

@@ -3,7 +3,7 @@ services:
   web:
     build:
       context: ..
-      dockerfile: Dockerfile
+      dockerfile: Dockerfile-3.1
     environment:
       # These are set in script/ci-build, so we need to pass-thru them.
       RAILS_ENV: $RAILS_ENV