add mod publishing gradle task

buildSrc/src/main/groovy/multiloader-publish.gradle

@@ -0,0 +1,35 @@
+plugins {
+    id "me.modmuss50.mod-publish-plugin"
+}
+
+publishMods {
+    if (project.name == 'fabric')
+        file = remapJar.archiveFile
+    else
+        file = jar.archiveFile
+
+    modLoaders.add(project.name)
+    type = STABLE
+    version = project.version
+    displayName = "[${project.name.capitalize()}] ${mod_name} ${mod_version}"
+    changelog = rootProject.file('CHANGELOG_LATEST.md').text
+
+    curseforge {
+        projectId = curseforge_id
+
+        dryRun = providers.environmentVariable("CURSEFORGE_API_KEY").getOrNull() == null
+        accessToken = providers.environmentVariable("CURSEFORGE_API_KEY")
+
+        minecraftVersions.addAll(minecraft_version_list.split(','))
+        serverRequired = true
+    }
+
+    modrinth {
+        projectId = modrinth_id
+
+        dryRun = providers.environmentVariable("MODRINTH_API_KEY").getOrNull() == null
+        accessToken = providers.environmentVariable("MODRINTH_API_KEY")
+
+        minecraftVersions.addAll(minecraft_version_list.split(','))
+    }
+}