Make Gitea display graphs in notebooks

TODO.md

@@ -10,3 +10,4 @@
 - [x] Use Gitea instead of GitLab
 - [ ] Add drone exec runner for Nix builds with shared `/nix`
 - [ ] Lint caddy file, add gzip and disable admin interface
+- [x] Make Gitea display graphs in Notebooks (see https://docs.gitea.io/en-us/external-renderers/).

docker/gitea/Dockerfile

@@ -0,0 +1,5 @@
+FROM gitea/gitea:1.17.1
+
+RUN apk --no-cache add gcc python3-dev py3-pip linux-headers musl-dev libffi-dev
+RUN pip3 install --upgrade pip
+RUN pip3 install jupyter

docker/gitea/docker-compose.yaml

@@ -2,7 +2,8 @@ version: "3"
 
 services:
   gitea:
-    image: gitea/gitea:1.17.1
+    image: pbrinkmeier/gitea
+    build: .
     restart: always
     environment:
       # Ref: https://docs.gitea.io/en-us/config-cheat-sheet
@@ -41,6 +42,11 @@ services:
       GITEA__mailer__PASSWD: "${GITEA_SMTP_PASSWORD}"
       GITEA__openid__ENABLE_OPENID_SIGNIN: "false"
       GITEA__openid__ENABLE_OPENID_SIGNUP: "false"
+      GITEA__markup_0x2E_jupyter__ENABLED: "true"
+      GITEA__markup_0x2E_jupyter__FILE_EXTENSIONS: ".ipynb"
+      GITEA__markup_0x2E_jupyter__RENDER_COMMAND: "jupyter nbconvert --stdin --stdout --to html --template basic"
+      GITEA__markup_0x2E_jupyter__IS_INPUT_FILE: "false"
+      GITEA__markup_0x2E_sanitizer_0x2E_jupyter_0x2E_img__ALLOW_DATA_URI_IMAGES: "true"
     volumes:
       - /var/lib/pbri/docker/gitea:/data
       - /etc/timezone:/etc/timezone:ro