Try a workaround for armv6 and armv7

See: pyca/cryptography#6673 (comment)
See: rust-lang/cargo#6513

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
             fail-fast: false
             max-parallel: 4
             matrix:
-                platform: ["linux/amd64", "linux/arm64/v8", "linux/386", "linux/ppc64le", "linux/s390x"]
+                platform: ["linux/arm/v6", "linux/arm/v7", "linux/arm64/v8", "linux/386", "linux/ppc64le", "linux/amd64", "linux/s390x"]
         steps:
             - name: Checkout repository
               uses: actions/checkout@v3

docker/Dockerfile

@@ -21,7 +21,12 @@ ADD https://github.com/RustPython/RustPython/commit/9cac89347e2276fcb309f108561e
 RUN mkdir /workdir/rp__doc__/ && tar --strip-components=1 -C /workdir/rp__doc__/ -xzf /tmp/rp__doc__.tar.gz
 
 RUN tar --strip-components=1 -C /workdir -xzf /tmp/v$RUST_PYTHON_VERSION.tar.gz
-RUN git  apply /tmp/9cac89347e2276fcb309f108561e99f4be5baff2.patch
+RUN git apply /tmp/9cac89347e2276fcb309f108561e99f4be5baff2.patch
+
+# armv6 and armv7 fix
+# See: https://github.com/pyca/cryptography/issues/6673#issuecomment-985943023
+# See: https://github.com/rust-lang/cargo/issues/6513
+RUN mkdir -p ~/.cargo/registry/index && cd ~/.cargo/registry/index && git clone --bare https://github.com/rust-lang/crates.io-index.git github.com-1ecc6299db9ec823
 
 # Remove the git mode that triggers an error on armv6 and armv7
 # Ref: https://github.com/rust-lang/cargo/issues/2808 (failed to mmap. Could not write data: Out of memory; class=Os (2))