ci: remove obsolete bump-n8n-version workflow

[krider2010]

The chart now defaults image.tag and appVersion to stable, and the docker-compose .env files use N8N_VERSION=stable. The weekly bump workflow would replace those rolling tags with a pinned upstream version, which defeats the move to stable. We also don't ship helm charts for the n-1 (1.x) branch, so there's no scenario where pinning the default is desired.

Closes #150.

[cubic-dev-ai]

No issues found across 1 file

Architecture diagram

sequenceDiagram
    participant Scheduler as GitHub Cron (weekly)
    participant Workflow as bump-n8n-version.yml
    participant ReleasesAPI as n8n Releases API
    participant RepoFiles as values.yaml / Chart.yaml / .env files
    participant Git as Git (branch, PR)

    Note over Scheduler,Git: OLD automated flow (now removed)

    Scheduler->>Workflow: Triggers every Wednesday 10:00 UTC
    Workflow->>Workflow: Checkout repo
    Workflow->>ReleasesAPI: Fetch latest stable release tag
    ReleasesAPI-->>Workflow: e.g. "1.30.0"

    Workflow->>RepoFiles: Read current image.tag from values.yaml
    RepoFiles-->>Workflow: "1.29.0"

    alt version differs
        Workflow->>RepoFiles: Update tag, appVersion, N8N_VERSION
        Workflow->>Git: Create branch, commit, push
        Workflow->>Git: Create pull request
    else already same
        Workflow->>Workflow: Skip – no update needed
    end

    Note over Workflow: Workflow file removed in this PR

    Note over Scheduler,Git: CURRENT state – no automated version bump
    Note over RepoFiles: All defaults set to "stable"

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_{Re-trigger cubic}