Update Appveyor build to MySQL 8.0.

This mirrors changes other projects have made in response to this issue: appveyor/ci#3894

Author: bgrainger

.ci/config/config.compression.json

@@ -1,10 +1,10 @@
 {
     "Data": {
-      "ConnectionString": "server=127.0.0.1;user id=mysqltest;password=test;port=3306;database=mysqltest;ssl mode=none;UseCompression=true;DefaultCommandTimeout=3600",
+      "ConnectionString": "server=127.0.0.1;user id=mysqltest;password=test;port=3306;database=mysqltest;ssl mode=none;UseCompression=true;DefaultCommandTimeout=3600;AllowPublicKeyRetrieval=true",
       "SocketPath": "./../../../../.ci/run/mysql/mysqld.sock",
       "PasswordlessUser": "no_password",
       "SecondaryDatabase": "testdb2",
-      "UnsupportedFeatures": "Ed25519,RsaEncryption,CachingSha2Password,QueryAttributes,Tls12,Tls13,UnixDomainSocket,UuidToBin",
+      "UnsupportedFeatures": "Ed25519,QueryAttributes,StreamingResults,Tls11,UnixDomainSocket,ZeroDateTime",
       "MySqlBulkLoaderLocalCsvFile": "../../../../tests/TestData/LoadData_UTF8_BOM_Unix.CSV",
       "MySqlBulkLoaderLocalTsvFile": "../../../../tests/TestData/LoadData_UTF8_BOM_Unix.TSV"
     }

.ci/config/config.json

@@ -1,10 +1,10 @@
 {
     "Data": {
-      "ConnectionString": "server=127.0.0.1;user id=mysqltest;password=test;port=3306;database=mysqltest;ssl mode=none;DefaultCommandTimeout=3600",
+      "ConnectionString": "server=127.0.0.1;user id=mysqltest;password=test;port=3306;database=mysqltest;ssl mode=none;DefaultCommandTimeout=3600;AllowPublicKeyRetrieval=true",
       "SocketPath": "./../../../../.ci/run/mysql/mysqld.sock",
       "PasswordlessUser": "no_password",
       "SecondaryDatabase": "testdb2",
-      "UnsupportedFeatures": "Ed25519,RsaEncryption,CachingSha2Password,QueryAttributes,Tls12,Tls13,UnixDomainSocket,UuidToBin",
+      "UnsupportedFeatures": "Ed25519,QueryAttributes,StreamingResults,Tls11,UnixDomainSocket,ZeroDateTime",
       "MySqlBulkLoaderLocalCsvFile": "../../../../tests/TestData/LoadData_UTF8_BOM_Unix.CSV",
       "MySqlBulkLoaderLocalTsvFile": "../../../../tests/TestData/LoadData_UTF8_BOM_Unix.TSV"
     }

appveyor.yml

@@ -1,6 +1,4 @@
-image: Previous Visual Studio 2022
-services:
-- mysql
+image: Visual Studio 2022
 environment:
   global:
     DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
@@ -15,9 +13,14 @@ install:
 build_script:
 - dotnet --info
 before_test:
+- ps: Start-Service MySQL80
 - cmd: |-
-    "C:\Program Files\MySQL\MySQL Server 5.7\bin\mysql.exe" -u root --password=Password12! < .ci\server\init.sql
-    "C:\Program Files\MySQL\MySQL Server 5.7\bin\mysql.exe" -u root --password=Password12! < .ci\server\init_sha256.sql
+    "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysql.exe" -u root --password=Password12! -e "SET GLOBAL log_bin_trust_function_creators = 1;"
+    "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysql.exe" -u root --password=Password12! -e "SET GLOBAL local_infile = 1;"
+    "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysql.exe" -u root --password=Password12! -e "SET GLOBAL max_connections = 250;"
+    "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysql.exe" -u root --password=Password12! < .ci\server\init.sql
+    "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysql.exe" -u root --password=Password12! < .ci\server\init_sha256.sql
+    "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysql.exe" -u root --password=Password12! < .ci\server\init_caching_sha2.sql
 test_script:
 - ps: .\.ci\test.ps1
 after_test:

tests/Conformance.Tests/DbFactoryFixture.cs

@@ -9,7 +9,7 @@ public class DbFactoryFixture : IDbFactoryFixture
 	{
 		public DbFactoryFixture()
 		{
-			ConnectionString = Environment.GetEnvironmentVariable("CONNECTION_STRING") ?? "Server=localhost;User Id=mysqltest;Password=test;SSL Mode=None";
+			ConnectionString = Environment.GetEnvironmentVariable("CONNECTION_STRING") ?? "Server=localhost;User Id=mysqltest;Password=test;SSL Mode=None;AllowPublicKeyRetrieval=true";
 		}
 
 		public string ConnectionString { get; }