Dockerfile: FromAsCasing: 'as' and 'FROM' keywords' casing do not match

I'm performing a custom build netboot-xyz in a drone pipeline and am receiving the following warning:

 2 warnings found (use --debug to expand):
 - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 3)
 - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 14)
Dockerfile:15
--------------------
  14 |     FROM netbootxyz-${NBXYZ_OVERRIDES} as final
  15 | >>> RUN \
  16 | >>>   echo "**** running ansible ****" && \
  17 | >>>   cd /ansible && \
  18 | >>>   ansible-playbook -i inventory site.yml ${EXTRA_VARS}
  19 |

Can this be resolved by fixing lines:

netboot.xyz/Dockerfile

Line 3 in cc085a7

FROM ghcr.io/netbootxyz/builder:latest as builder

netboot.xyz/Dockerfile

Line 14 in cc085a7

FROM netbootxyz-${NBXYZ_OVERRIDES} as final

so that both the FROM and AS keywords are uppercase?

For context, this is my drone step:

  - name: build
    image: docker:dind
    depends_on:
      - apply upstream version
    volumes:
    - name: dockersocket
      path: /var/run/docker.sock
    commands:
      - pwd
      # place custom user overrides
      - cp -v netbootxyz-configuration/user_overrides.yml working/netbootxyz/
      # place custom menu templates (see corresponding user_overrides)
      - mkdir working/netbootxyz/roles/netbootxyz/templates/custom
      - cp -v netbootxyz-configuration/custom-menu-templates/* working/netbootxyz/roles/netbootxyz/templates/custom
      # build
      - cd working/netbootxyz
      - docker build --no-cache -t netboot-build -f Dockerfile .
      - cid=$(docker create netboot-build)
      - docker cp $cid:/mnt/ $PWD/buildout
      # place file containing upstream netboot.xyz version
      - cp -v version.txt buildout/upstream-version.txt
      # clean-up
      - docker container prune -f
      - docker image rm netboot-build
      - cd /drone/src/

Thanks!

@antonym thanks, know it's a small item.