add mysql 8 to ci

.github/workflows/ci.yml

@@ -43,6 +43,7 @@ jobs:
           - "1.11.4-erlang-21.3.8.24-alpine-3.13.3"
         mysql:
           - "5.7"
+          - "8.0"
     steps:
       - uses: earthly/actions-setup@v1
       - uses: actions/checkout@v3

Earthfile

@@ -110,7 +110,10 @@ integration-test-mysql:
         --pull "mysql:$MYSQL"
         RUN set -e; \
             timeout=$(expr $(date +%s) + 30); \
-            docker run --name mysql --network=host -d -e MYSQL_ROOT_PASSWORD=root "mysql:$MYSQL" --sql_mode="ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION,ANSI_QUOTES"; \
+            docker run --name mysql --network=host -d -e MYSQL_ROOT_PASSWORD=root "mysql:$MYSQL" \
+            --sql_mode="ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION,ANSI_QUOTES" \
+            # the default authentication plugin for MySQL 8 is sha 256 but it doesn't come with the docker image. falling back to the 5.7 way
+            --default-authentication-plugin=mysql_native_password; \
             # wait for mysql to start
             while ! mysqladmin ping --host=127.0.0.1 --port=3306 --protocol=TCP --silent; do \
                 test "$(date +%s)" -le "$timeout" || (echo "timed out waiting for mysql"; exit 1); \

integration_test/myxql/test_helper.exs

@@ -106,6 +106,11 @@ excludes = [
 ]
 
 if Version.match?(version, ">= 8.0.0") do
+  # The default installation of MySQL 8.0 uses utf8mb4_0900_ai_ci as the collation for tables.
+  # However, it causes a collation error when a table's field is compared to `CAST(field AS char)`. The
+  # latter is given the collation utf8mb4_general_ci by MySQL and it is not clear how to fix this
+  # at the moment.
+  _ = TestRepo.query!("ALTER DATABASE ecto_test CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;", [])
   ExUnit.configure(exclude: excludes)
 else
   ExUnit.configure(exclude: [:values_list, :rename_column | excludes])