Update Dockerfile

Author: adequatej

Dockerfile

@@ -1,22 +1,25 @@
 FROM python:3.10-slim
-
+# Can happen early, almost never changes
 WORKDIR /opt/app
-COPY . .
-RUN pip install --no-cache-dir -r /opt/app/requirements.txt
 
-# Install packages that we need. vim is for helping with debugging
+# Install packages that we need.
+# Again does not change often 
 ENV DEBIAN_FRONTEND noninteractive
 RUN apt-get update && \
     apt-get upgrade -yq ca-certificates && \
     apt-get install -yq --no-install-recommends \
     prometheus-node-exporter
 
-
-EXPOSE 7860 
-EXPOSE 8000  
+# Some environment variables that don't change often
+EXPOSE 7860
+EXPOSE 8000
 EXPOSE 9100
-
-
 ENV GRADIO_SERVER_NAME="0.0.0.0"
 
-CMD bash -c "prometheus-node-exporter --web.listen-address=':9100' & python /opt/app/app.py"
+# We put this near the end since it can change
+COPY requirements.txt requirements.txt
+RUN pip install --no-cache-dir -r /opt/app/requirements.txt
+
+# This changes the most, so it goes last!
+COPY . .
+CMD bash -c "prometheus-node-exporter --web.listen-address=':9100' & python /opt/app/app.py"