Attempt to test on armv7l and build wheels (#12420)

Author: alex

.github/workflows/ci.yml

@@ -172,6 +172,8 @@ jobs:
 
           - {IMAGE: "ubuntu-rolling:aarch64", NOXSESSION: "tests", RUNNER: "ubuntu-24.04-arm"}
           - {IMAGE: "alpine:aarch64", NOXSESSION: "tests", RUNNER: "ubuntu-24.04-arm"}
+
+          - {IMAGE: "ubuntu-rolling:armv7l", NOXSESSION: "tests", RUNNER: "ubuntu-24.04-arm"}
     timeout-minutes: 15
     env:
       RUSTUP_HOME: /root/.rustup

.github/workflows/wheel-builder.yml

@@ -78,6 +78,8 @@ jobs:
           - { NAME: "manylinux_2_28_aarch64", CONTAINER: "cryptography-manylinux_2_28:aarch64", RUNNER: "ubuntu-24.04-arm" }
           - { NAME: "manylinux_2_34_aarch64", CONTAINER: "cryptography-manylinux_2_34:aarch64", RUNNER: "ubuntu-24.04-arm" }
           - { NAME: "musllinux_1_2_aarch64", CONTAINER: "cryptography-musllinux_1_2:aarch64", RUNNER: "ubuntu-24.04-arm" }
+
+          - { NAME: "manylinux_2_31_armv7l", CONTAINER: "cryptography-manylinux_2_31:armv7l", RUNNER: "ubuntu-24.04-arm" }
         exclude:
           # There are no readily available musllinux PyPy distributions
           - PYTHON: { VERSION: "pp310-pypy310_pp73" }
@@ -90,6 +92,10 @@ jobs:
             MANYLINUX: { NAME: "manylinux2014_x86_64", CONTAINER: "cryptography-manylinux2014:x86_64", RUNNER: "ubuntu-latest"}
           - PYTHON: { VERSION: "pp310-pypy310_pp73" }
             MANYLINUX: { NAME: "manylinux2014_aarch64", CONTAINER: "cryptography-manylinux2014_aarch64", RUNNER: "ubuntu-24.04-arm" }
+
+          # No PyPy on armv7l either
+          - PYTHON: { VERSION: "pp310-pypy310_pp73" }
+            MANYLINUX: { NAME: "manylinux_2_31_armv7l", CONTAINER: "cryptography-manylinux_2_31:armv7l", RUNNER: "ubuntu-24.04-arm" }
     name: "${{ matrix.PYTHON.VERSION }} for ${{ matrix.MANYLINUX.NAME }}"
     steps:
       - name: Ridiculous-er workaround for static node20

docs/installation.rst

@@ -30,6 +30,7 @@ operating systems.
 * x86-64 macOS 13 Ventura and ARM64 macOS 14 Sonoma
 * x86-64 Ubuntu 20.04, 22.04, 24.04, rolling
 * ARM64 Ubuntu rolling
+* ARMv7l Ubuntu rolling
 * x86-64 Debian Bullseye (11.x), Bookworm (12.x), Trixie (13.x), and
   Sid (unstable)
 * x86-64 and ARM64 Alpine (latest)