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aed0d63703 feat: track Flutter version in Renovate via Docker datasource (#452)
## Summary

- Adds a custom Renovate manager that reads the pinned Flutter version from `.fvmrc`
- Uses `ghcr.io/cirruslabs/flutter` as the Docker datasource so Renovate only proposes a bump when the corresponding image tag exists in the registry
- The CI pipeline (`ci/main.go`) already derives the Docker image tag from `.fvmrc` at runtime — `.fvmrc` is the single source of truth; no other files need grouping

## How it works

Renovate checks `ghcr.io/cirruslabs/flutter` for available tags. If `3.44.1` doesn't exist yet, no PR is opened. Once the image is published, Renovate opens a PR to bump `.fvmrc` — the only file that needs to change.

## Verification

- `renovate.json` schema validated
- Reviewed `ci/main.go`: `FlutterVersion` is read exclusively from `.fvmrc`; no hardcoded version strings elsewhere require additional grouping rules

Closes #447

Co-authored-by: Thomas SharedInbox <sharedinbox@thomas-guettler.de>
Reviewed-on: https://codeberg.org/guettli/sharedinbox/pulls/452
2026-06-05 22:42:47 +02:00

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{
"$schema": "https://docs.renovatebot.com/renovate-schema.json",
"extends": [
"config:recommended"
],
"labels": ["dependencies"],
"github-actions": {
"enabled": false
},
"packageRules": [
{
"matchUpdateTypes": ["minor", "patch", "pin", "digest", "lockFileMaintenance"],
"addLabels": ["automerge"]
},
{
"matchManagers": ["gomod"],
"matchFileNames": ["ci/**"],
"enabled": false
}
],
"customManagers": [
{
"customType": "regex",
"fileMatch": ["^\\.fvmrc$"],
"matchStrings": ["\"flutter\":\\s*\"(?<currentValue>[^\"]+)\""],
"depNameTemplate": "ghcr.io/cirruslabs/flutter",
"datasourceTemplate": "docker",
"versioningTemplate": "semver"
},
{
"customType": "regex",
"fileMatch": ["^\\.forgejo/Dockerfile$"],
"matchStrings": ["DAGGER_VERSION=(?<currentValue>[0-9]+\\.[0-9]+\\.[0-9]+)"],
"depNameTemplate": "dagger/dagger",
"datasourceTemplate": "github-releases",
"extractVersionTemplate": "^v(?<version>.*)$"
},
{
"customType": "regex",
"fileMatch": ["^DAGGER\\.md$"],
"matchStrings": ["github:dagger/nix/v(?<currentValue>[0-9]+\\.[0-9]+\\.[0-9]+)#dagger"],
"depNameTemplate": "dagger/dagger",
"datasourceTemplate": "github-releases",
"extractVersionTemplate": "^v(?<version>.*)$"
}
]
}