Add freqAI docker file

docker/Dockerfile.freqai

@@ -0,0 +1,8 @@
+ARG sourceimage=freqtradeorg/freqtrade
+ARG sourcetag=develop
+FROM ${sourceimage}:${sourcetag}
+
+# Install dependencies
+COPY requirements-freqai.txt /freqtrade/
+
+RUN pip install -r requirements-freqai.txt --user --no-cache-dir

requirements-freqai.txt

@@ -6,3 +6,4 @@ scikit-learn==1.0.2
 scikit-optimize==0.9.0
 joblib==1.1.0
 catboost==1.0.4
+#lightgbm==3.3.2