Temporarily disable linux/arm/v7 builds

The arm/v7 builds have caused lots of problems due to the lack of
support from the cryptography library, and now issues related to
installing the latest version of cffi. As a result, this build variant
has been removed for now. It may or may not come back later, since the
amount of work just to figure out which library is broken and how to fix
it doesn't feel worth it anymore.

.github/workflows/buildx.yml

@@ -42,10 +42,10 @@ jobs:
           docker buildx ls
           docker buildx build --push \
             --tag benbusby/whoogle-search:latest \
-            --platform linux/amd64,linux/arm/v7,linux/arm64 .
+            --platform linux/amd64,linux/arm64 .
           docker buildx build --push \
             --tag ghcr.io/benbusby/whoogle-search:latest \
-            --platform linux/amd64,linux/arm/v7,linux/arm64 .
+            --platform linux/amd64,linux/arm64 .
       - name: build and push tag
         if: startsWith(github.ref, 'refs/tags')
         run: |