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

Not sure if this is feasible to use with Tilt due to fairly long build times, might be necessary to pause deployment of the resources in Tilt and manually triggering as and when needed.

Author: soenkeliebau

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 'crate2nix'
+builder = settings.get('builder', 'crate2nix')
+
 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 "${EXPECTED_REGISTRY}/' + operator_name + '" && ./result/load-image | docker load',
-    deps=['rust', 'Cargo.toml', 'Cargo.lock', 'default.nix', "nix", 'build.rs', 'vendor'],
-    ignore=['*.~undo-tree~'],
-    # ignore=['result*', 'Cargo.nix', 'target', *.yaml],
-    outputs_image_ref_to='result/ref',
-)
+if builder == 'crate2nix':
+    custom_build(
+        registry + '/' + operator_name,
+        'make regenerate-nix && nix-build . -A docker --argstr dockerName "${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')