Add option to disable Gravatar via environment variable (Privacy improvement)

[rezzorix]

Related to #1843

This adds an optional environment variable, DISABLE_GRAVATAR, to disable Gravatar usage.
It is useful for users who want to improve privacy and avoid external requests to Gravatar.

Add to docker-compose.yml

environment:
  DISABLE_GRAVATAR: 'true'

When set to true:

• Gravatar is no longer queried when disabled.
• Gravatar URLs are not generated
• the avatar field returns an empty string
• the frontend falls back to the default local avatar

When set to false or left unset:

• existing behavior remains unchanged / Gravatar is requested (again)

Tested with:

• new users
• existing users

[jc21]

Can you please consider adding documentation for this to docs/src/faq/index.md as a new FAQ answer?

[rezzorix]

@jc21 Yes, will do this ✅

[nginxproxymanagerci]

CI Error:

/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8): No such file or directory
certbot-node: Pulling from nginxproxymanager/nginx-full
Digest: sha256:b258c49eb54f67430900b235e93a890605162a57f877c115c700a65783d9ede0
Status: Image is up to date for nginxproxymanager/nginx-full:certbot-node
docker.io/nginxproxymanager/nginx-full:certbot-node
�[1;34m❯ �[1;36mTesting backend ...�[0m
yarn install v1.22.22
[1/4] Resolving packages...
[2/4] Fetching packages...
warning lru.min@1.1.4: The engine "bun" appears to be invalid.
warning lru.min@1.1.4: The engine "deno" appears to be invalid.
warning sql-escaper@1.3.3: The engine "bun" appears to be invalid.
warning sql-escaper@1.3.3: The engine "deno" appears to be invalid.
[3/4] Linking dependencies...
warning " > @apidevtools/json-schema-ref-parser@15.3.5" has unmet peer dependency "@types/json-schema@^7.0.15".
warning " > mysql2@3.22.3" has unmet peer dependency "@types/node@>= 8".
warning " > @apidevtools/swagger-parser@12.1.0" has unmet peer dependency "openapi-types@>=7".
[4/4] Building fresh packages...
Done in 19.19s.
yarn run v1.22.22
$ biome lint .
Checked 88 files in 48ms. No fixes applied.
Done in 0.12s.
�[1;34m❯ �[1;32mTesting Complete�[0m
�[1;34m❯ �[1;36mBuilding ...�[0m
#0 building with "default" instance using docker driver

#1 [internal] load build definition from Dockerfile
#1 transferring dockerfile: 2.20kB done
#1 DONE 0.0s

#2 [internal] load metadata for docker.io/nginxproxymanager/testca:latest
#2 ...

#3 [internal] load metadata for docker.io/nginxproxymanager/nginx-full:certbot-node
#3 DONE 0.6s

#2 [internal] load metadata for docker.io/nginxproxymanager/testca:latest
#2 DONE 0.6s

#4 [internal] load .dockerignore
#4 transferring context: 2B done
#4 DONE 0.0s

#5 [internal] load build context
#5 transferring context: 3.92MB 0.0s done
#5 DONE 0.1s

#6 [testca 1/1] FROM docker.io/nginxproxymanager/testca:latest@sha256:14d7c3250135d3ebc058b1e8bb41b171f622b7cb5fc2b4b2bcc8f555cf926140
#6 resolve docker.io/nginxproxymanager/testca:latest@sha256:14d7c3250135d3ebc058b1e8bb41b171f622b7cb5fc2b4b2bcc8f555cf926140 0.0s done
#6 DONE 0.1s

#7 [stage-1  1/11] FROM docker.io/nginxproxymanager/nginx-full:certbot-node@sha256:b258c49eb54f67430900b235e93a890605162a57f877c115c700a65783d9ede0
#7 resolve docker.io/nginxproxymanager/nginx-full:certbot-node@sha256:b258c49eb54f67430900b235e93a890605162a57f877c115c700a65783d9ede0 0.0s done
#7 DONE 0.3s

#6 [testca 1/1] FROM docker.io/nginxproxymanager/testca:latest@sha256:14d7c3250135d3ebc058b1e8bb41b171f622b7cb5fc2b4b2bcc8f555cf926140
#6 sha256:9ab966394e7386f8e212deb17c9369ed98d5eb3a4df9070c28d96bae1362e810 116B / 116B 0.0s done
#6 sha256:c99c8ac6013d99408e670c2d0ebeac923d390d90c09a55b4e0b266d0cc061e65 2.86kB / 2.86kB 0.0s done
#6 sha256:29a151a3ba18b782725510791d49c081fb88a4f0633331fd0f826d36655fb78e 58.56kB / 58.56kB 0.0s done
#6 sha256:987ab97de7c8e28cebb6b45a2546298654c7d25b24720c371d04838152bb3e95 1.36kB / 1.36kB done
#6 sha256:4f4fb700ef54461cfa02571ae0db9a0dc1e0cdb5577484a6d75e68dc38e8acc1 0B / 32B 0.1s
#6 sha256:f19dea81e0af6255cb52700a24ca2dec7ff42c12c20486f1bd6e7fac5c735db3 0B / 16.68MB 0.1s
#6 sha256:3882371c5807b6189df26b2c3139baab81e7ceee303ec493ac1c9f8445fb7171 0B / 9.38MB 0.1s
#6 sha256:b275842c598b60e8357d6da9be429887df83c85f3266eb8f6368291a03727348 0B / 3.91MB 0.1s
#6 ...

#8 [stage-1  3/11] COPY docker/scripts/install-s6 /tmp/install-s6
#8 CACHED

#9 [stage-1  4/11] RUN /tmp/install-s6 "linux/amd64" && rm -f /tmp/install-s6
#9 CACHED

#10 [stage-1  6/11] COPY frontend/dist /app/frontend
#10 CACHED

#11 [stage-1  8/11] RUN yarn install 	&& yarn cache clean
#11 CACHED

#12 [stage-1  5/11] COPY backend       /app
#12 CACHED

#13 [stage-1  7/11] WORKDIR /app
#13 CACHED

#14 [stage-1  9/11] COPY docker/rootfs /
#14 CACHED

#15 [stage-1 10/11] COPY --from=testca /home/step/certs/root_ca.crt /etc/ssl/certs/NginxProxyManager.crt
#15 ERROR: short read: expected 32 bytes but got 0: unexpected EOF

#16 [stage-1  2/11] RUN echo "fs.file-max = 65535" > /etc/sysctl.conf 	&& apt-get update 	&& apt-get install -y --no-install-recommends jq logrotate 	&& apt-get clean 	&& rm -rf /var/lib/apt/lists/*
#16 CANCELED
------
 > [stage-1 10/11] COPY --from=testca /home/step/certs/root_ca.crt /etc/ssl/certs/NginxProxyManager.crt:
------
Dockerfile:48
--------------------
  46 |     # add late to limit cache-busting by modifications
  47 |     COPY docker/rootfs /
  48 | >>> COPY --from=testca /home/step/certs/root_ca.crt /etc/ssl/certs/NginxProxyManager.crt
  49 |     
  50 |     # Remove frontend service not required for prod, dev nginx config as well
--------------------
ERROR: failed to build: failed to solve: failed to compute cache key: short read: expected 32 bytes but got 0: unexpected EOF

[rezzorix]

@jc21 Added to FAQ ✅