Split crypto + pyopenssl reqs for armv7 builds

Since including rust in the builder stage of the image didn't address
the issues with building the cryptography library on armv7, that
architecture will just use the last supported version of the affected
libraries. May want to revisit this later.

Dockerfile

@@ -5,9 +5,7 @@ RUN apk --update add \
     libxml2-dev \
     libxslt-dev \
     openssl-dev \
-    libffi-dev \
-    rust \
-    cargo
+    libffi-dev
 
 COPY requirements.txt .
 

requirements.txt

@@ -6,7 +6,8 @@ certifi==2022.12.7
 cffi==1.15.1
 chardet==5.1.0
 click==8.1.3
-cryptography==39.0.1
+cryptography==3.3.2; platform_machine == 'armv7l'
+cryptography==39.0.1; platform_machine != 'armv7l'
 cssutils==2.6.0
 defusedxml==0.7.1
 Flask==2.2.3
@@ -19,7 +20,8 @@ packaging==23.0
 pluggy==1.0.0
 pycodestyle==2.10.0
 pycparser==2.21
-pyOpenSSL==23.0.0
+pyOpenSSL==19.1.0; platform_machine == 'armv7l'
+pyOpenSSL==23.0.0; platform_machine != 'armv7l'
 pyparsing==3.0.9
 PySocks==1.7.1
 pytest==7.2.1