chore(deps): pin thegeeklab/alpine docker tag (#1)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| thegeeklab/alpine | final | pin | `latest` -> `latest` |

📌 **Important**: Renovate will wait until you have merged this Pin PR before creating any *upgrade* PRs for the affected packages. Add the preset `:preserveSemverRanges` to your config if you instead don't wish to pin dependencies.

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 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box.

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This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).

Reviewed-on: docker/hugo#1
Co-authored-by: Renovator Bot <renovator@rknet.org>
Co-committed-by: Renovator Bot <renovator@rknet.org>

Dockerfile

@@ -1,4 +1,4 @@
-FROM thegeeklab/alpine:latest
+FROM thegeeklab/alpine:latest@sha256:1d985a44c907f1dafaeaeb40f52b569c8f52877491fe12f9262084d1875b91d4
 
 LABEL maintainer="Robert Kaussow <mail@thegeeklab.de>"
 LABEL org.opencontainers.image.authors="Robert Kaussow <mail@thegeeklab.de>"