onlyoffice previews much faster and more robust, added --oosetup helper, improved error/log handling

docker/onlyoffice-converter-patch/Dockerfile

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+# Patched OnlyOffice Document Server with configurable converter worker count.
+#
+# The Community Edition hardcodes the document converter to 1 worker,
+# which creates a severe bottleneck under concurrent load.
+# This image patches the open-source license.js to spawn a configurable
+# number of converter workers (default 8).
+#
+# Build:
+#   docker build -t onlyoffice-cista docker/onlyoffice-converter-patch
+#
+# Run:
+#   docker run -d -p 8988:80 \
+#     -e WORKERS=16 \
+#     -e JWT_SECRET=your-strong-secret \
+#     --name onlyoffice onlyoffice-cista
+#
+# JWT:
+#   Set JWT_SECRET to the same value you pass to Cista as ONLYOFFICE_JWT_SECRET.
+#   OnlyOffice will enable token validation automatically.
+#
+# The ONLYOFFICE_VERSION build arg lets you target a specific release.
+
+ARG ONLYOFFICE_VERSION=9.3.1
+
+FROM onlyoffice/documentserver:${ONLYOFFICE_VERSION}
+
+# Prevent interactive apt prompts
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install Node.js, npm, and git so we can run the FileConverter from source.
+RUN apt-get update -qq && \
+    apt-get install -y -qq --no-install-recommends \
+        nodejs \
+        npm \
+        git \
+        ca-certificates && \
+    rm -rf /var/lib/apt/lists/*
+
+# Clone the open-source server components (shallow, ~15 MB).
+# The master branch is used because the Linux/web tags are not published
+# in the server repo; the license.js file has been stable for years.
+RUN git clone --depth 1 https://github.com/ONLYOFFICE/server.git /opt/oo-server
+
+# Patch license.js so the converter worker count is read from an env var
+# instead of being hardcoded to 1.
+RUN sed -i \
+    's/count: 1,/count: parseInt(process.env.WORKERS, 10) || 8,/' \
+    /opt/oo-server/Common/sources/license.js
+
+# Install npm dependencies for the modules the FileConverter touches.
+# DocService deps are also needed because converter.js pulls in baseConnector.
+RUN cd /opt/oo-server/Common      && npm ci --no-audit --no-fund
+RUN cd /opt/oo-server/FileConverter && npm ci --no-audit --no-fund
+RUN cd /opt/oo-server/DocService  && npm ci --no-audit --no-fund
+
+# Back up the compiled pkg binary and replace it with our wrapper.
+RUN mv /var/www/onlyoffice/documentserver/server/FileConverter/converter \
+       /var/www/onlyoffice/documentserver/server/FileConverter/converter.orig
+
+COPY converter-wrapper.sh /var/www/onlyoffice/documentserver/server/FileConverter/converter
+RUN chmod +x /var/www/onlyoffice/documentserver/server/FileConverter/converter
+
+# Default worker count (override at runtime with -e WORKERS=16).
+ENV WORKERS=8
+
+# Use our custom entrypoint to persist the env var to a file that the
+# non-root converter process (user=ds) can read.
+COPY entrypoint.sh /app/ds/run-document-server-patched.sh
+RUN chmod +x /app/ds/run-document-server-patched.sh
+ENTRYPOINT ["/app/ds/run-document-server-patched.sh"]

docker/onlyoffice-converter-patch/converter-wrapper.sh

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+#!/bin/bash
+# Wrapper that runs the OnlyOffice FileConverter from patched Node.js source.
+# Replaces the compiled pkg binary shipped with the Community Edition.
+
+# The env var is not passed through supervisor to the 'ds' user, so we read
+# it from a file written by the custom entrypoint.
+if [ -z "${WORKERS}" ] && [ -r /tmp/oo-converter-workers.txt ]; then
+  export WORKERS=$(cat /tmp/oo-converter-workers.txt)
+fi
+
+cd /opt/oo-server/FileConverter || exit 1
+
+export NODE_ENV=production-linux
+export NODE_CONFIG_DIR=/etc/onlyoffice/documentserver
+export NODE_DISABLE_COLORS=1
+export APPLICATION_NAME=onlyoffice
+export LD_LIBRARY_PATH=/var/www/onlyoffice/documentserver/server/FileConverter/bin
+
+exec node sources/convertermaster.js "$@"

docker/onlyoffice-converter-patch/entrypoint.sh

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+#!/bin/bash
+# Custom entrypoint that persists WORKERS to a file readable by
+# the non-root user that supervisor uses to run the converter.
+
+echo "${WORKERS:-8}" > /tmp/oo-converter-workers.txt
+chmod 644 /tmp/oo-converter-workers.txt
+
+exec /app/ds/run-document-server.sh "$@"