working i think

.gitignore

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+init
+init/
+init/*
+
+synapse
+synapse/
+synapse/*

Dockerfile

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+FROM debian:sid-slim
+WORKDIR /root
+
+ARG PHPVERSION=7.4
+SHELL ["/bin/bash", "-c"]
+#Initial update packges
+RUN apt update && apt upgrade -y
+
+# Language setup
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+ENV LC_ALL en_US.UTF-8
+RUN apt install locales -y \
+ && apt auto-remove -y \
+ && apt clean -y
+RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen \
+ && locale-gen
+
+# Enable Backports
+#RUN echo 'deb http://deb.debian.org/debian bullseye-backports main' > /etc/apt/sources.list.d/bullseye-backports.list \
+# && apt update
+
+# Installing basic tools
+RUN apt install bzip2 zip unzip git gnupg2 ca-certificates lsb-release apt-transport-https wget curl nano vim -y --no-install-recommends \
+ && apt auto-remove -y \
+ && apt clean -y
+
+# Platform-specific prerequisites to run python module
+RUN apt install build-essential python3-dev libffi-dev \
+                python3-pip python3-setuptools sqlite3 \
+                libssl-dev virtualenv libjpeg-dev libxslt1-dev -y --no-install-recommends
+
+RUN mkdir -p ~/synapse \
+ && virtualenv -p python3 ~/env \
+ && source ~/env/bin/activate \
+ && pip install --upgrade pip \
+ && pip install --upgrade setuptools \
+ && pip install matrix-synapse
+
+
+#autostart files
+COPY buildfiles/auto_config.sh .
+COPY buildfiles/start_services.sh .
+RUN chmod +x auto_config.sh
+RUN chmod +x start_services.sh
+CMD ["./start_services.sh"]

buildfiles/auto_config.sh

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+#!/bin/bash
+cd /root/synapse
+source /root/env/bin/activate
+python -m synapse.app.homeserver \
+    --server-name $SERVERNAME \
+    --config-path homeserver.yaml \
+    --generate-config \
+    --report-stats=$REPORTSTATUS
+touch /root/init/init

buildfiles/start_services.sh

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+#!/bin/bash
+
+#auto configs
+if ! [ -f /root/init/init ]
+then /root/auto_config.sh
+fi
+cd /root/synapse
+source /root/env/bin/activate
+synctl start --no-daemonize

docker-compose.yml

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+version: '3.5'
+services:
+#########################
+   app:
+      build: .
+      image: git.shihaam.dev/dockerfiles/matrix-synapse
+      hostname: matrix-synapse
+      volumes:
+         - ./init:/root/init
+         - ./synapse:/root/synapse
+      ports:
+         - 8006:80
+      restart: always
+      environment:
+         REPORTSTATUS: 'no'
+         SERVERNAME: matrix.shihaam.me