Support for Docker and added non-default base directory argument

docker/Dockerfile.amd64

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+FROM amd64/ubuntu
+
+# Create directory
+RUN mkdir -p /presence
+WORKDIR /presence
+
+# Install and update packages
+RUN apt-get update && apt-get install -y bluez git
+
+# Install Mosquitto and friends
+RUN apt-get install -y \
+  libwebsockets-dev \
+  libmosquitto-dev \
+  mosquitto \
+  mosquitto-clients
+
+# Copy and change script permissions
+COPY presence.sh .
+RUN chmod +x presence.sh
+
+# Set entrypoint and run
+ENTRYPOINT ["/bin/bash"]
+CMD ["/presence/presence.sh", "-p", "/config"]

docker/Dockerfile.armhf

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+FROM resin/raspberry-pi-debian
+
+# Create directory
+RUN mkdir -p /presence
+WORKDIR /presence
+
+# Install and update packages
+RUN apt-get update && apt-get install -y bluez git
+
+# Install Mosquitto and friends
+RUN apt-get install -y \
+  libwebsockets-dev \
+  libmosquitto-dev \
+  mosquitto \
+  mosquitto-clients
+
+# Copy and change script permissions
+COPY presence.sh .
+RUN chmod +x presence.sh
+
+# Set entrypoint and run
+ENTRYPOINT ["/bin/bash"]
+CMD ["/presence/presence.sh", "-p", "/config"]

docker/README.md

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+# Presence Docker Installation
+
+### Dockerfiles
+
+The `docker` folder contains Dockerfiles for deploying Presence in Docker containers on different architectures. Choose the file that matches your machine's architecture:
+
+**`Dockerfile.amd64`**
+<br>
+Your typical x64 machine - if you are deploying on a 64-bit laptop or desktop, this is the one you want.
+
+**`Dockerfile.armhf`**
+<br>
+The Raspberry Pi architecture - use this file if you are deploying on a Raspbery Pi. Confirmed working on:
+  - Raspberry Pi Zero W
+  - Raspberry Pi 3
+
+### Example Docker Compose Installation
+
+1. Create a file called `docker-compose.yaml` and copy the example template below to the file.
+
+2. Create a local configuration directory on your host machine and create the files `behavior_preferences`, `mqtt_preferences`, and `owner_devices` per the main repository instructions.
+
+3. Change `<YOUR_ARCHITECTURE>` to the Dockerfile extension that matches your architecture.
+
+4. Change `<YOUR_LOCAL_CONFIG>` to the path of the local configuration directory you created in Step 2.
+
+
+```
+version: "3"
+services:
+
+  # Presence  --------------------------------------
+  presence:
+    container_name: presence
+    network_mode: "host"
+    build:
+      context: https://github.com/iicky/presence.git
+      dockerfile: docker/Dockerfile.<YOUR_ARCHITECTURE>
+    volumes:
+      - <YOUR_LOCAL_CONFIG>:/config
+    restart: on-failure
+```
+
+5. Build and deploy the Docker container by running the following commands:
+
+```
+docker-compose build presence
+docker-compose up -d presence
+```