FLoC network opt-out

Feature
16

This should do you:

## Any custom commands to run after building
run:
  - exec: echo "Beginning of custom commands"
  - replace:
     filename: "/etc/nginx/conf.d/discourse.conf"
     from: /location \/ {/
     to: |
       location / {
           add_header X-Clacks-Overhead "GNU Terry Pratchett";
           add_header Permissions-Policy "interest-cohort=()";

adapted from How to add a custom HTTP header to your Discourse
aside: how very topical for today: Terry Pratchett’s debut turns 50: ‘At 17 he showed promise of a brilliant mind’ | Books | The Guardian

result is:

○ → curl -I https://testmachine/srv/status
HTTP/2 200 
server: nginx
date: Tue, 20 Apr 2021 17:48:15 GMT
content-type: text/plain; charset=utf-8
x-frame-options: SAMEORIGIN
x-xss-protection: 1; mode=block
x-content-type-options: nosniff
x-download-options: noopen
x-permitted-cross-domain-policies: none
referrer-policy: strict-origin-when-cross-origin
x-request-id: ef02ce7c-fabc-49b9-986e-c2c46e50f8e4
x-runtime: 0.004575
x-redis-calls: 1
x-redis-time: 0.000153
x-queue-time: 0.000952
x-clacks-overhead: GNU Terry Pratchett
permissions-policy: interest-cohort=()
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