Add workflow for updating tld.h file

[Falci]

This PR adds a GitHub action script that will:

• Checkout and install hs-names with its dependencies
• Download the TLD and zone file from ICANN
• Update the src/tld.h
• Commit and create a PR

There's no automatic trigger for this action. It needs to be manually triggered from the actions page.

[rithvikvibhu]

Tried this out and running the workflow (manually) created a PR.

• Workflow run: https://github.com/rithvikvibhu/hnsd/actions/runs/7004925576/job/19053663531
• PR created (on my fork): Update tld.h rithvikvibhu/hnsd#1

I also wanted to collect some data on how often the root zone changes and affects resolvability, but hnsd seems to be unstable when it gets a few queries that respond with SERVFAIL. It starts responding with NXDOMAIN/SERVFAIL even for working domains. Either a restart or wait for some time (cache?) will make the domains work again.

For ex, the long list of SERVFAILs here are false-negatives:

So while I don't have an exact count, some examples of TLDs that should work but don't:

❯ dig @127.0.0.1 -p 9592 abb +dnssec

; <<>> DiG 9.18.19 <<>> @127.0.0.1 -p 9592 abb +dnssec
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 32885
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 4096
;; QUESTION SECTION:
;abb.                           IN      A

;; Query time: 2220 msec
;; SERVER: 127.0.0.1#9592(127.0.0.1) (UDP)
;; WHEN: Mon Nov 27 22:22:57 IST 2023
;; MSG SIZE  rcvd: 32

❯ dig @1.1.1.1 nic.abb +dnssec

; <<>> DiG 9.18.19 <<>> @1.1.1.1 nic.abb +dnssec
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33053
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 1232
;; QUESTION SECTION:
;nic.abb.                       IN      A

;; ANSWER SECTION:
nic.abb.                300     IN      A       138.224.0.118
nic.abb.                300     IN      RRSIG   A 8 2 300 20231211063301 20231127063301 37583 nic.abb. ZXrhU2XGq4mws44phZqEPBLKUb3dcNw3m/dahV4aSZ31TAgvlVxwLiIZ GtqnH5x0VGebHGwzAyzB7GPr0OIi6IykY8+zyMwegHAWmnZc1lf5xkmb FatJ91smr5G9mZyJFcOJ0qouBqlTVFx0R+qMV1dMlna7fPaj0JJJjXcO n1M=

;; Query time: 336 msec
;; SERVER: 1.1.1.1#53(1.1.1.1) (UDP)
;; WHEN: Mon Nov 27 22:23:10 IST 2023
;; MSG SIZE  rcvd: 219