Create a template file for init

This allows us to use database.zig for CI, while still creating a blank
database.zig for new projects that are created via jetzig init

cli/commands/init.zig

@@ -106,7 +106,7 @@ pub fn run(
     try copySourceFile(
         allocator,
         install_dir,
-        "demo/config/database.zig",
+        "demo/config/database_template.zig",
         "config/database.zig",
         null,
     );

demo/config/database_template.zig

@@ -0,0 +1,48 @@
+pub const database = .{
+    // Null adapter fails when a database call is invoked.
+    .development = .{
+        .adapter = .null,
+    },
+    .testing = .{
+        .adapter = .null,
+    },
+    .production = .{
+        .adapter = .null,
+    },
+    // PostgreSQL adapter configuration.
+    //
+    // All options except `adapter` can be configured using environment variables:
+    //
+    // * JETQUERY_HOSTNAME
+    // * JETQUERY_PORT
+    // * JETQUERY_USERNAME
+    // * JETQUERY_PASSWORD
+    // * JETQUERY_DATABASE
+    //
+    // .testing = .{
+    //     .adapter = .postgresql,
+    //     .hostname = "localhost",
+    //     .port = 5432,
+    //     .username = "postgres",
+    //     .password = "password",
+    //     .database = "myapp_testing",
+    // },
+    //
+    // .development = .{
+    //     .adapter = .postgresql,
+    //     .hostname = "localhost",
+    //     .port = 5432,
+    //     .username = "postgres",
+    //     .password = "password",
+    //     .database = "myapp_development",
+    // },
+    //
+    // .production = .{
+    //     .adapter = .postgresql,
+    //     .hostname = "localhost",
+    //     .port = 5432,
+    //     .username = "postgres",
+    //     .password = "password",
+    //     .database = "myapp_production",
+    // },
+};