Repository/image name should be lowercased automatically.

Name components may contain lowercase letters, digits and separators. A separator is defined as a period, one or two underscores, or one or more dashes. A name component may not start or end with a separator. Src: https://docs.docker.com/engine/reference/commandline/tag/#extended-description.

I have no idea if the same rule applies to username or registry, but I have a failing build due to this. Note that repository name is feeded with ${{ github.repository }}/gateway. Currently, there is no toLower function in Actions.

2020-04-26T12:49:01.8839602Z ##[group]Run docker/build-push-action@v1
2020-04-26T12:49:01.8839748Z with:
2020-04-26T12:49:01.8839835Z   username: 0xbkt
2020-04-26T12:49:01.8840486Z   password: ***
2020-04-26T12:49:01.8840585Z   repository: 0xbkt/rEdAcTeD/gateway
2020-04-26T12:49:01.8840655Z   registry: docker.pkg.github.com
2020-04-26T12:49:01.8840739Z   tags: latest
2020-04-26T12:49:01.8840819Z   tag_with_ref: false
2020-04-26T12:49:01.8840902Z   tag_with_sha: false
2020-04-26T12:49:01.8840968Z   path: .
2020-04-26T12:49:01.8841048Z   always_pull: false
2020-04-26T12:49:01.8841130Z   add_git_labels: false
2020-04-26T12:49:01.8841225Z   push: true
2020-04-26T12:49:01.8841290Z ##[endgroup]
2020-04-26T12:49:01.8867757Z ##[command]/usr/bin/docker run --name dockergithubactionsv1_68dc5e --label c27d31 --workdir /github/workspace --rm -e INPUT_USERNAME -e INPUT_PASSWORD -e INPUT_REPOSITORY -e INPUT_REGISTRY -e INPUT_TAGS -e INPUT_TAG_WITH_REF -e INPUT_TAG_WITH_SHA -e INPUT_PATH -e INPUT_DOCKERFILE -e INPUT_TARGET -e INPUT_ALWAYS_PULL -e INPUT_BUILD_ARGS -e INPUT_CACHE_FROMS -e INPUT_LABELS -e INPUT_ADD_GIT_LABELS -e INPUT_PUSH -e HOME -e GITHUB_JOB -e GITHUB_REF -e GITHUB_SHA -e GITHUB_REPOSITORY -e GITHUB_REPOSITORY_OWNER -e GITHUB_RUN_ID -e GITHUB_RUN_NUMBER -e GITHUB_ACTOR -e GITHUB_WORKFLOW -e GITHUB_HEAD_REF -e GITHUB_BASE_REF -e GITHUB_EVENT_NAME -e GITHUB_WORKSPACE -e GITHUB_ACTION -e GITHUB_EVENT_PATH -e RUNNER_OS -e RUNNER_TOOL_CACHE -e RUNNER_TEMP -e RUNNER_WORKSPACE -e ACTIONS_RUNTIME_URL -e ACTIONS_RUNTIME_TOKEN -e ACTIONS_CACHE_URL -e GITHUB_ACTIONS=true -e CI=true -v "/var/run/docker.sock":"/var/run/docker.sock" -v "/home/runner/work/_temp/_github_home":"/github/home" -v "/home/runner/work/_temp/_github_workflow":"/github/workflow" -v "/home/runner/work/rEdAcTeD/rEdAcTeD":"/github/workspace" docker/github-actions:v1  "build-push"
2020-04-26T12:49:05.7322652Z Logging in to registry docker.pkg.github.com
2020-04-26T12:49:05.7555246Z WARNING! Using --password via the CLI is insecure. Use --password-stdin.
2020-04-26T12:49:05.8533235Z WARNING! Your password will be stored unencrypted in /github/home/.docker/config.json.
2020-04-26T12:49:05.8533483Z Login Succeeded
2020-04-26T12:49:05.8533831Z Configure a credential helper to remove this warning. See
2020-04-26T12:49:05.8534604Z https://docs.docker.com/engine/reference/commandline/login/#credentials-store
2020-04-26T12:49:05.8534726Z 
2020-04-26T12:49:05.8547653Z Building image [docker.pkg.github.com/0xbkt/rEdAcTeD/gateway:latest]
2020-04-26T12:49:05.8721089Z invalid argument "docker.pkg.github.com/0xbkt/rEdAcTeD/gateway:latest" for "-t, --tag" flag: invalid reference format: repository name must be lowercase
2020-04-26T12:49:05.8721637Z See 'docker build --help'.
2020-04-26T12:49:05.8734269Z Error: exit status 125
2020-04-26T12:49:05.8738409Z Usage:
2020-04-26T12:49:05.8738519Z exit status 125
2020-04-26T12:49:05.8739333Z   github-actions build-push [flags]
2020-04-26T12:49:05.8739585Z 
2020-04-26T12:49:05.8739769Z Flags:
2020-04-26T12:49:05.8740834Z   -h, --help   help for build-push
2020-04-26T12:49:05.8741420Z 

[noahjahn]

The comment above says this was implemented with the v2 of the docker/build-push-action. This doesn’t seem to be the case – I still get an error when the username of the owner of the repository is not all lowercase.

[ccvca]

Warning: The set-env command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/

This is the “modern” version for setting env. (see https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-commands-for-github-actions#environment-files )

    - name: PrepareReg Names
      run: |
        echo IMAGE_REPOSITORY=$(echo ${{ github.repository }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
        echo IMAGE_TAG=$(echo ${{ github.ref }} | tr '[:upper:]' '[:lower:]' | awk '{split($0,a,"/"); print a[3]}') >> $GITHUB_ENV