feat(docker): use latest TF version and update rovers default TF path

[FalcoSuessgott]

Hi,

I havent really followed #69, but this PR is perhaps a smaller fix when using rovers docker image and thus easier to review / merge.

Firstly, Terraform was twice installed (/usr/local/bin/terraform & /bin/terraform) with outdated versions. This PR fixes this, uses the latest stable TF version (v1.5.5) and changes rovers default TF path to match the one in the container (/bin/terraform).

What do you think?

[FalcoSuessgott]

In order to use rover in Gitlab and host the webserver on Gitlab pages I had to do the following:

pages:
  stage: pages
  image:
    name: im2nguyen/rover
    entrypoint: [""]
  before_script:
    # remove deprecated TF versions
    - rm $(which terraform)
    - rm $(which terraform)
    # install latest TF
    - apk add terraform --repository=https://dl-cdn.alpinelinux.org/alpine/edge/community
  script:
    - mkdir public
    - rover -standalone -tfVarsFile=${CI_PROJECT_DIR}/terraform.tfvars -tfPath=$(which terraform) -standalone -planJSONPath="${CI_PROJECT_DIR}/${TF_PROJECT_DIR}/${TF_OUTPUT_DIR}/terraform.plan"
    - mv rover.zip ${CI_PROJECT_DIR}/public/.
    - unzip ${CI_PROJECT_DIR}/public/rover.zip -d ${CI_PROJECT_DIR}/public/.
  artifacts:
    paths:
      - ${CI_PROJECT_DIR}/public/
  rules:
    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

With this PR we would not need the before_script part ...

[mcmanustfj]

@im2nguyen