error during connect: lookup thedockerhost on *: no such host - docker

Question

I'm new to building docker images in gitlab ci and keep returning an error during connect error.
I set up my docker image in Gitlab to be created in AWS.
Dockerfile
FROM python:3-alpine
RUN apk add --update git bash curl unzip zip openssl make
ENV TERRAFORM_VERSION="0.12.28"
RUN curl https://releases.hashicorp.com/terraform/${TERRAFORM_VERSION}/terraform_${TERRAFORM_VERSION}_linux_amd64.zip > terraform_${TERRAFORM_VERSION}_linux_amd64.zip && \
unzip terraform_${TERRAFORM_VERSION}_linux_amd64.zip -d /bin && \
rm -f terraform_${TERRAFORM_VERSION}_linux_amd64.zip
RUN pip install awscli boto3
ENTRYPOINT ["terraform"]
.gitlab-ci.yml
variables:
DOCKER_REGISTRY: *.dkr.ecr.eu-west-2.amazonaws.com
AWS_DEFAULT_REGION: eu-west-2
APP_NAME: mytestbuild
DOCKER_HOST: tcp://thedockerhost:2375/
#publish script
publish:
image:
name: amazon/aws-cli:latest
entrypoint: [""]
services:
- docker:dind
before_script:
- amazon-linux-extras install docker
- aws --version
- docker --version
script:
- docker build -t $DOCKER_REGISTRY/$APP_NAME:$CI_PIPELINE_IID .
- aws ecr get-login-password | docker login --username AWS --password-stdin $DOCKER_REGISTRY
- docker push $DOCKER_REGISTRY/$APP_NAME:$CI_PIPELINE_IID
When I push the file up to GitLab and the script begins to run it fails and presents this error code
error during connect: Post
"http://thedockerhost:2375/v1.24/build?buildargs=%7B%7D&cachefrom=%5B%5D&cgroupparent=&cpuperiod=0&cpuquota=0&cpusetcpus=&cpusetmems=&cpushares=0&dockerfile=Dockerfile&labels=%7B%7D&memory=0&memswap=0&networkmode=default&rm=1&shmsize=0&t=854124157125.dkr.ecr.eu-west-2.amazonaws.com%2Fmytestbuild%3A20&target=&ulimits=null&version=1":
dial tcp: lookup thedockerhost on 172.20.0.10:53: no such host
I've tried a few things to try to sort it out but it is mostly related to using docker: latest image, however, I also found that using amazon/aws-cli should also work. None of what I have seen has worked, and I'd appreciate the help.