[CI] Create lighting-terminal PR CI job which persistently updates litd's tapd dependency to main HEAD

[dstadulis]

Motivation:

• When changes to tapd occur, in order to fully conclude the ramifications of the PR, testing must occur in litd CI pipeline.
• There have been instances of tapd PRs been merged, but testing coverage could have been more comprehensive.
• By creating these perpetually updating tapd dependency PRs, the cross-daemon CI process will be less fault prone

Implementation ideas:

An update notification method

entr
Github Actions
Time-based cron job

Should Update

the tapd module dependency to

• origin/main HEAD
• or be extensible to set a development branch (for future releases where engineers want to refrain from merging into main)

[ellemouton]

Do you only want things to run on merge to master or do you want things to run when a new PR is opened?

[ellemouton]

(also - i'd say this is something that needs to happen on the taproot-assets github actions side since there you can subscribe to actions from the tap repo)

[dstadulis]

Do you only want things to run on merge to master or do you want things to run when a new PR is opened?

ah yeah probably most appropriate for the checks to run during PR