Added option to allow the user the option of not using crate2nix but the default Docker build process instead.

template/Tiltfile

@@ -1,21 +1,29 @@
-# If tilt_options.json exists read it and load the default_registry value from it
+# If tilt_options.json exists read it
 settings = read_json('tilt_options.json', default={})
 registry = settings.get('default_registry', 'oci.stackable.tech/sandbox')
 
 # Configure default registry either read from config file above, or with default value of "oci.stackable.tech/sandbox"
 default_registry(registry)
 
+# Configure which builder to use from config file, defaults to 'nix'
+builder = settings.get('builder', 'nix')
+
 meta = read_json('nix/meta.json')
 operator_name = meta['operator']['name']
 
-custom_build(
-    registry + '/' + operator_name,
-    'make regenerate-nix && nix-build . -A docker --argstr dockerName "${EXPECTED_REGISTRY}/' + operator_name + '" && ./result/load-image | docker load',
-    deps=['rust', 'Cargo.toml', 'Cargo.lock', 'default.nix', "nix", 'build.rs', 'vendor'],
-    ignore=['*.~undo-tree~'],
-    # ignore=['result*', 'Cargo.nix', 'target', *.yaml],
-    outputs_image_ref_to='result/ref',
-)
+if builder == 'nix':
+    custom_build(
+        registry + '/' + operator_name,
+        'make regenerate-nix && nix-build . -A docker --argstr dockerName "${EXPECTED_REGISTRY}/' + operator_name + '" && ./result/load-image | docker load',
+        deps=['rust', 'Cargo.toml', 'Cargo.lock', 'default.nix', "nix", 'build.rs', 'vendor'],
+        ignore=['*.~undo-tree~'],
+        # ignore=['result*', 'Cargo.nix', 'target', *.yaml],
+        outputs_image_ref_to='result/ref',
+    )
+else if builder == 'docker':
+    docker_build(registry + '/' + operator_name, '.', dockerfile='docker/Dockerfile')
+else:
+    fail('Unsupported builder specified: [' + builder + '] - currently supported builders are: [docker, crate2nix]')
 
 # Load the latest CRDs from Nix
 watch_file('result')