doc: update docs/dockerfile.md (#364)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
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renovate[bot]
2023-05-12 12:08:09 +08:00
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@ -29,7 +29,7 @@ FROM [--platform=<platform>] <image> [AS <name>]
```dockerfile
FROM ruby:3.2.2
FROM golang:1.19-alpine3.16 AS build-env
FROM golang:1.20-alpine3.16 AS build-env
```
### 变量 ENV