feat: support for embedding code snippets

[mdelapenya]

Description

This pull request includes changes to the Dockerfile, documentation, and template files to support embedding code snippets from the testcontainers-go repository into the documentation. The most important changes include adding a new build stage to clone the testcontainers-go repository, updating the documentation to include an embedded code snippet, and modifying the shortcode template to handle these embedded snippets.

Dockerfile changes:

• Added a new build stage git-src-oss to clone the testcontainers-go repository and copy it to the project directory ([DockerfileR36-R45](diffhunk://#diff-dd2c0eb6ea5cfc6c4bd4eac30934e2d5746747af48fef6da689e85b752f39557R36-R45)).

Documentation changes:

• Updated content/manuals/testcontainers.md to include an embedded Go code snippet from the testcontainers-go repository ([content/manuals/testcontainers.mdR45-R46](diffhunk://#diff-7905b168f0bee5db6711b541f42c48f5d0901c8cdc17f323e3c1725a5445a3dcR45-R46)).

IMPORTANT: this change is a demonstration on how to use the embedding shortcode.

Template changes:

• Created layouts/shortcodes/embedded.html to handle embedded code snippets, including logic to identify and extract specific code sections based on custom tags ([layouts/shortcodes/embedded.htmlR1-R65](diffhunk://#diff-dc256c151d3b9c325236dc0c38d0ef5155ce617bb93d44b669b7641a00fbe42aR1-R65)).

The tag is using the following format:

• start tag: // START $id
• end tag: // END $id

Exception: for testcontainers-go, where this mechanism already exists, we are using different start/end tags:

• start tag: // $id {
• end tag: // }

Reviews

• [x] Technical review
• [ ] Editorial review
• [ ] Product review

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[docker-robot[bot]]

Thanks for the pull request. We'd like to make our product docs better, but haven’t been able to review all the suggestions. As our docs have also diverged, we do not have the bandwidth to review and rebase old pull requests.

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