Move CI from TravisCI to GitHub Actions

[johnttompkins]

Issue #, if available:

Description of changes: Adds CI job that achieves parity with the current travis PR run (runs pre-commit). The other file also handles releasing to PyPI. There is a scoped token that we have uploaded as a github secret that we can use to publish to our PyPI repo. Tested on my repo with a test token and test repository:

/usr/bin/docker run --name a9377fd141b0b7cce9fa0615d628_7d5844 --label 179394 --workdir /github/workspace --rm -e AWS_DEFAULT_REGION -e pythonLocation -e LD_LIBRARY_PATH -e INPUT_PASSWORD -e INPUT_REPOSITORY_URL -e INPUT_USER -e INPUT_PACKAGES_DIR -e INPUT_VERIFY_METADATA -e INPUT_SKIP_EXISTING -e INPUT_VERBOSE -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_RETENTION_DAYS -e GITHUB_ACTOR -e GITHUB_WORKFLOW -e GITHUB_HEAD_REF -e GITHUB_BASE_REF -e GITHUB_EVENT_NAME -e GITHUB_SERVER_URL -e GITHUB_API_URL -e GITHUB_GRAPHQL_URL -e GITHUB_WORKSPACE -e GITHUB_ACTION -e GITHUB_EVENT_PATH -e GITHUB_ACTION_REPOSITORY -e GITHUB_ACTION_REF -e GITHUB_PATH -e GITHUB_ENV -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/_temp/_runner_file_commands":"/github/file_commands" -v "/home/runner/work/cloudformation-cli/cloudformation-cli":"/github/workspace" 179394:5265a9377fd141b0b7cce9fa0615d628  "__token__" "***" "https://test.pypi.org/legacy/" "dist" "true" "false" "false"
Checking dist/cloudformation_cli-0.2.1-py3-none-any.whl: PASSED
Checking dist/cloudformation-cli-0.2.1.tar.gz: PASSED
Uploading distributions to https://test.pypi.org/legacy/
Uploading cloudformation_cli-0.2.1-py3-none-any.whl

  0%|          | 0.00/96.2k [00:00<?, ?B/s]
100%|██████████| 96.2k/96.2k [00:01<00:00, 66.1kB/s]
Uploading cloudformation-cli-0.2.1.tar.gz

  0%|          | 0.00/74.8k [00:00<?, ?B/s]
100%|██████████| 74.8k/74.8k [00:01<00:00, 69.1kB/s]

View at:
https://test.pypi.org/project/cloudformation-cli/0.2.1/

Very similar to aws-cloudformation/cloudformation-cli-python-plugin#138

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[PatMyron]

Can we remove .travis.yml in these PRs as well? Easier to review the diff for parity if that's part of the PR

[johnttompkins]

Can we remove .travis.yml in these PRs as well? Easier to review the diff for parity if that's part of the PR

Removed it in the last commit. Checks will show as incomplete since we require a travis success in the repo settings and there isn't one in this PR now. Will remove requirement once this is approved.

[PatMyron]

probably currently stuck on pylint support like the plugin, but we should eventually run this for Python 3.9 as well:

Suggested change

	python: [3.6, 3.7, 3.8]
	python: [3.6, 3.7, 3.8, 3.9]

[PatMyron]

Is this environment variable used for anything btw?

Suggested change

	env:
	AWS_DEFAULT_REGION: us-east-1