Arm build fixes (#68)

* Add rustc compiler and remove when not needed (smaller docker layer)

* Using the magical ARG CRYPTOGRAPHY_DONT_BUILD_RUST=1 to get around ARM issues

.github/workflows/image.yml

@@ -2,7 +2,7 @@ name: Test, build and push to Docker Hub
 
 on:
   push:
-    branches: [ master ]
+    branches: [ master, arm-build ]
 
 jobs:
   build:

Dockerfile

@@ -1,6 +1,10 @@
 FROM python:3.8-slim
+
+# rustc compiler would be needed on ARM type devices but theres an issue with some deps not building..
+ARG CRYPTOGRAPHY_DONT_BUILD_RUST=1
+
 COPY requirements.txt /tmp/requirements.txt
-RUN apt-get update && apt-get install -y libssl-dev libffi-dev gcc libc-dev libxslt-dev zlib1g-dev g++ --no-install-recommends && rm -rf /var/lib/apt/lists/* /var/cache/apt/*
+RUN apt-get update && apt-get install -y libssl-dev libffi-dev gcc libc-dev libxslt-dev zlib1g-dev rustc g++ --no-install-recommends && rm -rf /var/lib/apt/lists/* /var/cache/apt/*
 RUN pip3 install --upgrade pip && pip3 install --no-cache-dir -r /tmp/requirements.txt 
 
  
@@ -26,6 +30,7 @@ ENV PYTHONUNBUFFERED=1
 # Attempt to store the triggered commit
 ARG SOURCE_COMMIT
 ARG SOURCE_BRANCH
+RUN apt-get remove rustc *-dev --purge -y
 RUN echo "commit: $SOURCE_COMMIT branch: $SOURCE_BRANCH" >/source.txt
 
 CMD [ "python", "./changedetection.py" , "-d", "/datastore"]