ci: write image tag to global.image.tag

[levivannoort]

The applications repo moves image to global.image (generic chart 1.7.0 — see appwrite-labs/helm-charts#17); this updates the tag-bump automation to write the single canonical path .global.image.tag in default.yaml.

Merge order: land appwrite-labs/assets-applications#29 first. Until then, an old-style per-alias write still overrides global, so deploys stay correct in either interim state (a stale per-alias tag key would just need removing).

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR updates the staging deployment workflow to write the image tag to .global.image.tag in default.yaml, aligning with the migration from per-alias image keys to a single global.image path introduced in the generic Helm chart 1.7.0.

• The yq command now targets .global.image.tag in staging/mcp-for-docs/default.yaml instead of .["mcp-for-docs"].image.tag in fra1.yaml.
• The git add path is updated consistently to default.yaml, so the modified file will be staged and committed correctly.

Confidence Score: 5/5

Both the yq write and the git add are updated to default.yaml consistently; the change is a straightforward path migration with no dangling references.

The two-line change is internally consistent — the yq command and git add both target default.yaml. A previous review flagged a potential mismatch between those two lines, but in this version of the diff both have been updated correctly, so that concern is resolved.

No files require special attention.

Important Files Changed

Filename	Overview
.github/workflows/staging.yml	Updates the image-tag bump to write .global.image.tag in default.yaml instead of the old per-alias path in fra1.yaml; both the yq write target and the git add path are updated consistently.

_{Reviews (2): Last reviewed commit: "Update staging.yml" | Re-trigger Greptile}

[ChiragAgg5k]

I cannot approve this as-is: the workflow now writes to ${{ env.ENVIRONMENT }}/${{ env.PROJECT }}/default.yaml, but the commit step still runs git add ${{ env.ENVIRONMENT }}/${{ env.PROJECT }}/fra1.yaml. That means the modified default.yaml file will not be staged, so the deploy job can report "No changes to commit" and skip pushing the updated tag. Please update the git add path to default.yaml to match the yq target.