Added rootless and plain custom dockerfiles

.gitignore

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+/data/
+/config/

Dockerfile

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+FROM gitea/gitea:1.20.5
+
+RUN apk --no-cache add py3-pip pandoc-cli
+
+RUN pip3 install --upgrade pip
+RUN pip3 install nbconvert
+
+COPY custom/app.ini /data/gitea/conf/app.ini

Dockerfile.rootless

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+FROM gitea/gitea:1.20.5-rootless
+
+USER root:root
+
+RUN apk --no-cache add py3-pip pandoc-cli
+
+RUN pip3 install --upgrade pip
+RUN pip3 install nbconvert
+
+USER git:git
+
+COPY custom/ /etc/gitea/custom

custom/app.ini

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+APP_NAME = dm1sh gitea
+
+[server]
+LANDING_PAGE = "/dm1sh"
+
+; [database]
+; DB_TYPE = postgres
+; HOST = ***:5432
+; NAME = gitea
+; USER = gitea
+; PASSWD = ***
+; CHARSET = utf8
+
+[admin]
+DEFAULT_EMAIL_NOTIFICATIONS = onmention
+
+[service]
+DISABLE_REGISTRATION = true
+
+; [mailer]
+; ENABLED = true
+; FROM = gitea@dmitriy.icu
+; SMTP_ADDR = mail.dmitriy.icu
+; SMTP_PORT = 465
+; USER = gitea@dmitriy.icu
+; PASSWD = `***`
+
+[markup.jupyter]
+ENABLED = true
+FILE_EXTENSIONS = .ipynb
+RENDER_COMMAND = "jupyter nbconvert --stdin --stdout --to html --template basic"
+IS_INPUT_FILE = false
+
+[markup.sanitizer.jupyter.img]
+ALLOW_DATA_URI_IMAGES = true
+
+[markup.sanitizer.TeX]
+ELEMENT = span
+ALLOW_ATTR = class
+REGEXP = ^\s*((math(\s+|$)|inline(\s+|$)|display(\s+|$)))+
+
+[markup.docx]
+ENABLED = true
+FILE_EXTENSIONS = .docx
+RENDER_COMMAND = "timeout 30s pandoc +RTS -M512M -RTS -f docx --to html --embed-resources --mathml"
+
+[markup.sanitizer.docx.img]
+ALLOW_DATA_URI_IMAGES = true
+
+[markup.odt]
+ENABLED = true
+FILE_EXTENSIONS = .odt
+RENDER_COMMAND = "timeout 30s pandoc +RTS -M512M -RTS -f odt --to html --embed-resources --mathml"
+RENDER_CONTENT_MODE = no-sanitizer