Dockerfile: move the default values for images to Dockerfile to fix build checks warnings

move the default values for images to Dockerfile to fix build checks warnings which might
come from an empty variable.

```
 => WARN: InvalidDefaultArgInFrom: Default value for ARG ${BUILDER_IMAGE} results in empty or inval  0.0s
 => WARN: InvalidDefaultArgInFrom: Default value for ARG ${BASE_IMAGE_FULL} results in empty or inv  0.0s
 => WARN: InvalidDefaultArgInFrom: Default value for ARG ${BASE_IMAGE_MINIMAL} results in empty or   0.0s
```
Signed-off-by: Feruzjon Muyassarov <[email protected]>

Signed-off-by: Feruzjon Muyassarov <[email protected]>

Author: fmuyassarov

Dockerfile

@@ -3,7 +3,7 @@ ARG BASE_IMAGE_FULL
 ARG BASE_IMAGE_MINIMAL
 
 # Build node feature discovery
-FROM ${BUILDER_IMAGE} AS builder
+FROM ${BUILDER_IMAGE:-golang} AS builder
 
 # Get (cache) deps in a separate layer
 COPY go.mod go.sum /go/node-feature-discovery/
@@ -23,7 +23,7 @@ RUN --mount=type=cache,target=/go/pkg/mod/ \
     make install VERSION=$VERSION HOSTMOUNT_PREFIX=$HOSTMOUNT_PREFIX
 
 # Create full variant of the production image
-FROM ${BASE_IMAGE_FULL} AS full
+FROM ${BASE_IMAGE_FULL:-debian:stable-slim} AS full
 
 # Run as unprivileged user
 USER 65534:65534
@@ -35,7 +35,7 @@ COPY deployment/components/worker-config/nfd-worker.conf.example /etc/kubernetes
 COPY --from=builder /go/bin/* /usr/bin/
 
 # Create minimal variant of the production image
-FROM ${BASE_IMAGE_MINIMAL} AS minimal
+FROM ${BASE_IMAGE_MINIMAL:-scratch} AS minimal
 
 # Run as unprivileged user
 USER 65534:65534