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docs: add Google Trust Services instructions (#1144)

* Create Google-Trust-Services.md

Add basic details on using the GTS ACME endpoint.

* Update README.md

add a link to the Google Trust Services doc.
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Andy Warner 2024-08-27 11:06:11 -06:00 committed by GitHub
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## Google Trust Services
[Google Trust Service](https://pki.goog/) is an ACME CA with generous default quota and high ubiquity.
Using Google Trust Services through an ACME client, like in this container, allows for unlimited 90 days and multi-domains (SAN) certificates.
### Activation
Google Trust Services support is activated when the `ACME_CA_URI` environment variable is set to the Google Trust Services ACME endpoint (`https://dv.acme-v02.api.pki.goog/directory`).
### Account
Google Trust Services requires the use of an externally bound account. First create a [Google Trust Services account](https://cloud.google.com/certificate-manager/docs/public-ca-tutorial#request-key-hmac):
- provide the pre-generated [EAB credentials](https://tools.ietf.org/html/rfc8555#section-7.3.4) using the `ACME_EAB_KID` and `ACME_EAB_HMAC_KEY` environment variables.
These variables can be set on the proxied containers or directly on the **acme-companion** container.

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[Container configuration](./Container-configuration.md)
[Google Trust Services](./Google-Trust-Services.md)
[Persistent data](./Persistent-data.md)
[Standalone certificates](./Standalone-certificates.md)