Add .dockerignore file

Before the docker CLI sends the context to the docker daemon, it looks for a file named .dockerignore in the root directory of the context. If this file exists, the CLI modifies the context to exclude files and directories that match patterns in it. This helps to avoid unnecessarily sending large or sensitive files and directories to the daemon and potentially adding them to images using ADD or COPY.

Rename repository to ci_and_crosscompile

For the repository owner, contribution guidelines are a way to communicate how people should contribute.

For contributors, the guidelines help them verify that they're submitting well-formed pull requests and opening useful issues.

For both owners and contributors, contribution guidelines save time and hassle caused by improperly created pull requests or issues that have to be rejected and re-submitted.

A code of conduct defines standards for how to engage in a community. It signals an inclusive environment that respects all contributions. It also outlines procedures for addressing problems between members of your project's community.

When you add an issue template to your repository, project contributors will automatically see the template's contents in the issue body. Templates customize and standardize the information you'd like included when contributors open issues.

When you add a pull request template to your repository, project contributors will automatically see the template's contents in the pull request body. Templates customize and standardize the information you'd like included when contributors create pull requests.

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