Fix Dockerfile (vapor#772)

Author: 0xTim

Dockerfile

@@ -1,13 +1,20 @@
-FROM alpine:3.14
+FROM swift:5.7
 
-RUN apk update && apk add py3-pip
+RUN apt-get update && apt-get install -y python3-pip
 
 COPY requirements.txt .
 
-RUN pip install -r requirements.txt
+RUN pip3 install -r requirements.txt
 
 WORKDIR /docs
 
+COPY . .
+
+RUN mkdocs build
+RUN swift fixSearchIndex.swift
+RUN cp googlefc012e5d94cfa05f.html site/googlefc012e5d94cfa05f.html;
+RUN swift setUpRedirects.swift
+
 EXPOSE 8000
 
 CMD [ "mkdocs","serve","-a","0.0.0.0:8000"]