chore: include python for service to support canvas-based plotly image generation

Dockerfile

@@ -6,6 +6,7 @@ WORKDIR /usr/src/app
 # install dependencies into temp directory
 # this will cache them and speed up future builds
 RUN apk add --no-cache git
+RUN apk add --no-cache python3
 
 RUN mkdir /app
 WORKDIR /app