try to use dockerfile directly

Dockerfile

@@ -0,0 +1,56 @@
+# set base image (host OS)
+FROM python:3.8
+
+# set the working directory in the container
+WORKDIR /app
+
+# set env tag
+ENV RUN_IN_DOCKER Yes
+
+# copy the dependencies file to the working directory
+COPY requirements.txt .
+
+# install odbc driver
+RUN curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add - && \
+    curl https://packages.microsoft.com/config/debian/10/prod.list > /etc/apt/sources.list.d/mssql-release.list
+
+RUN apt-get update && apt-get install -y unzip unixodbc-dev git nano ghostscript
+RUN ACCEPT_EULA=Y apt-get install -y msodbcsql17
+
+# allow ghostscript PDF conversion
+RUN sed 's/rights="none" pattern="PDF"/rights="read | write" pattern="PDF"/g' /etc/ImageMagick-6/policy.xml -i
+
+# install dependencies
+RUN pip install -r requirements.txt
+
+# copy the content of the local src directory to the working directory
+COPY src/ ./src
+
+# create config folder
+RUN mkdir -p /app/config
+
+# clone repo
+RUN git clone https://github.com/ReceiptManager/receipt-manager-webapp.git
+
+# compile frontend with polymer
+RUN curl -sL https://deb.nodesource.com/setup_16.x | bash
+RUN apt-get install -y nodejs
+RUN npm install -g polymer-cli
+RUN cd receipt-manager-webapp/Frontend && polymer build
+RUN mkdir -p /app/webroot && mkdir -p /app/webroot/ssl && mkdir -p /app/webroot/settings && cp -a receipt-manager-webapp/Frontend/build/default/. /app/webroot
+RUN cp -rf receipt-manager-webapp/Frontend/lang/. /app/webroot/lang
+RUN yes | cp -rf receipt-manager-webapp/Frontend/node_modules/lit-html/. /app/webroot/node_modules/lit-html
+RUN cp -r receipt-manager-webapp/Frontend/node_modules/lit-element/lit-element.js.map /app/webroot/node_modules/lit-element/lit-element.js.map
+RUN cp -r receipt-manager-webapp/Frontend/node_modules/lit-element/lib/*.map /app/webroot/node_modules/lit-element/lib
+RUN cp -r receipt-manager-webapp/Frontend/node_modules/@webcomponents/webcomponentsjs/. /app/webroot/node_modules/@webcomponents/webcomponentsjs
+RUN cp -r receipt-manager-webapp/Frontend/node_modules/web-animations-js/*.map /app/webroot/node_modules/web-animations-js
+RUN cp -r receipt-manager-webapp/Frontend/img/. /app/webroot/img
+RUN cp receipt-manager-webapp/Frontend/favicon.ico /app/webroot/favicon.ico
+RUN rm -rf receipt-manager-webapp
+
+WORKDIR /app/src
+
+EXPOSE 8721
+
+# command to run on container start
+CMD [ "python", "-u", "./__init__.py" ]

captain-definition

@@ -1,9 +1,4 @@
  {
   "schemaVersion": 2,
-  "dockerfileLines": [
+  "dockerfilePath": "./Dockerfile"
-                        "FROM monolidth/receipt-parser:latest",
-                        "EXPOSE 8721",
-                        "WORKDIR /app/src",
-                        "CMD [ \"python\", \"-u\", \"./__init__.py\" ]"
-                    ]
  }