Add the grpc extension for the google spanner integration (#2944)

* Add grpc to the docker image

Signed-off-by: Bob Weinand <bob.weinand@datadoghq.com>

* Don't enable grpc by default

Signed-off-by: Bob Weinand <bob.weinand@datadoghq.com>

---------

Signed-off-by: Bob Weinand <bob.weinand@datadoghq.com>

Makefile

@@ -1269,7 +1269,9 @@ test_integrations_frankenphp: global_test_run_dependencies
 test_integrations_roadrunner: global_test_run_dependencies tests/Frameworks/Roadrunner/Version_2/composer.lock-php$(PHP_MAJOR_MINOR)
 	$(call run_tests_debug,tests/Integrations/Roadrunner/V2)
 test_integrations_googlespanner: global_test_run_dependencies tests/Integrations/GoogleSpanner/composer.lock-php$(PHP_MAJOR_MINOR)
+	$(eval TEST_EXTRA_INI=-d extension=grpc.so)
 	$(call run_tests_debug,tests/Integrations/GoogleSpanner)
+	$(eval TEST_EXTRA_INI=)
 test_integrations_sqlsrv: global_test_run_dependencies
 	$(eval TEST_EXTRA_INI=-d extension=sqlsrv.so)
 	$(call run_tests_debug,tests/Integrations/SQLSRV)

dockerfiles/ci/buster/build-extensions.sh

@@ -159,6 +159,12 @@ else
     popd
   fi
 
+  # ext-grpc is needed for google spanner
+  if [[ $PHP_VERSION_ID -ge 80 ]]; then
+    pecl install grpc;
+    # avoid installing it by default, it seems to stall some testsuites.
+  fi
+
   # We don't install any redis.so to inis, but allow selection at runtime.
   if [[ $PHP_VERSION_ID -lt 80 ]]; then
     pecl install redis-3.1.6