Set new plugin center url in update step

Fixes the issue, that migrated instances of SCM-Manager still use the
old plugin center url and therefore cannot read the new plugins.

scm-webapp/src/main/java/sonia/scm/update/plugin/PluginCenterUpdateStep.java

@@ -0,0 +1,70 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package sonia.scm.update.plugin;
+
+import sonia.scm.config.ScmConfiguration;
+import sonia.scm.migration.UpdateStep;
+import sonia.scm.plugin.Extension;
+import sonia.scm.store.ConfigurationStore;
+import sonia.scm.store.ConfigurationStoreFactory;
+import sonia.scm.version.Version;
+
+import javax.inject.Inject;
+
+import static sonia.scm.version.Version.parse;
+
+@Extension
+public class PluginCenterUpdateStep implements UpdateStep {
+
+  private final ConfigurationStoreFactory configurationStoreFactory;
+
+  @Inject
+  public PluginCenterUpdateStep(ConfigurationStoreFactory configurationStoreFactory) {
+    this.configurationStoreFactory = configurationStoreFactory;
+  }
+
+  @Override
+  public void doUpdate() {
+    ConfigurationStore<ScmConfiguration> configurationStore = configurationStoreFactory
+      .withType(ScmConfiguration.class)
+      .withName("config")
+      .build();
+    configurationStore.getOptional()
+      .ifPresent(config -> {
+        config.setPluginUrl(ScmConfiguration.DEFAULT_PLUGINURL);
+        configurationStore.set(config);
+      });
+  }
+
+  @Override
+  public Version getTargetVersion() {
+    return parse("2.0.0");
+  }
+
+  @Override
+  public String getAffectedDataType() {
+    return "sonia.scm.plugin-center";
+  }
+}