Try resurrecting sql server tests on ci

.ci/test_blocklist.txt

@@ -20,8 +20,4 @@ qgis_openclutilstest
 # Relies on a broken/unreliable 3rd party service
 qgis_layerdefinition
 
-# MSSQL requires the MSSQL docker
-PyQgsProviderConnectionMssql
-
-
 

.ci/test_flaky.txt

@@ -4,6 +4,3 @@ qgis_wcsprovidertest
 PyQgsWFSProviderGUI
 qgis_ziplayertest
 
-# Flaky, the ms odbc driver crashes a lot on the ubuntu docker image. Retest when
-# the docker base image is upgraded
-PyQgsMssqlProvider

.docker/docker-qgis-test.sh

@@ -86,31 +86,31 @@ fi
 # Restore SQL Server test data
 ##############################
 
-# echo "Importing SQL Server test data..."
+echo "Importing SQL Server test data..."
 
-# export SQLUSER=sa
-# export SQLHOST=mssql
-# export SQLPORT=1433
-# export SQLPASSWORD='<YourStrong!Passw0rd>'
-# export SQLDATABASE=qgis_test
+export SQLUSER=sa
+export SQLHOST=mssql
+export SQLPORT=1433
+export SQLPASSWORD='<YourStrong!Passw0rd>'
+export SQLDATABASE=qgis_test
 
-# export PATH=$PATH:/opt/mssql-tools/bin
+export PATH=$PATH:/opt/mssql-tools/bin
 
-# pushd /root/QGIS > /dev/null
-# /root/QGIS/tests/testdata/provider/testdata_mssql.sh
-# popd > /dev/null # /root/QGIS
+pushd /root/QGIS > /dev/null
+/root/QGIS/tests/testdata/provider/testdata_mssql.sh
+popd > /dev/null # /root/QGIS
 
-# echo "Setting up DSN for test SQL Server"
+echo "Setting up DSN for test SQL Server"
 
-# cat <<EOT > /etc/odbc.ini
-# [ODBC Data Sources]
-# testsqlserver = ODBC Driver 17 for SQL Server
+cat <<EOT > /etc/odbc.ini
+[ODBC Data Sources]
+testsqlserver = ODBC Driver 17 for SQL Server
 
-# [testsqlserver]
-# Driver       = ODBC Driver 17 for SQL Server
-# Description  = Test SQL Server
-# Server       = mssql
-# EOT
+[testsqlserver]
+Driver       = ODBC Driver 17 for SQL Server
+Description  = Test SQL Server
+Server       = mssql
+EOT
 
 ###########
 # Run tests