add Dockerfile and docker-compose.yml with environmets

.env.example

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+CHECK_FREQUENCY_SECONDS: default value for --check-frequency-seconds param
+OPNSENSE_MAIN_HOST: default value for --main-host param
+OPNSENSE_BACKUP_HOST: default value for --backup-host param
+OPNSENSE_USERNAME: default value for --opnsense-user param
+OPNSENSE_PASSWORD: default value for --opnsense-password param
+OPNSENSE_INTERFACES: default value for --opnsense-interfaces param

Dockerfile

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+FROM python:latest
+
+#WORKDIR /usr/app/src
+
+# Install package
+WORKDIR /code
+COPY . .
+
+#COPY prometheus-ssh-exporter.py ./
+#COPY requirements.txt ./
+
+RUN pip3 install -r requirements.txt
+
+RUN python -u setup.py install
+
+# Set this to the port you want to expose
+EXPOSE 8000
+
+# Set the -p option to the port you exposed above, defaults to 8000
+#CMD ["python", "-u", "opnsense-exporter"]
+#CMD ["sleep", "60"]
+CMD ["opnsense-exporter"]

docker-compose.yml

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+version: '3.4'
+
+services:
+  opnsense-exporter:
+    image: opnsense-exporter
+    build:
+      context: .
+      dockerfile: ./Dockerfile
+    restart: always
+    container_name: opnsense-exporter
+    #network_mode: "host" 
+    ports:
+      - 8000:8000
+    env_file:
+      - .env
+    logging:
+        driver: "json-file"
+        options:
+            max-file: "3"
+            max-size: 10m