Add a test case for armv7 uv on aarch64 (#18532)

Reproduces https://github.com/astral-sh/uv/issues/18509
Related https://github.com/astral-sh/uv/pull/18517
Requires #18530

.github/workflows/build-dev-binaries.yml

@@ -71,6 +71,42 @@ jobs:
             ./target/no-debug/uvx
           retention-days: 1
 
+  build-binary-linux-armv7-gnueabihf:
+    name: "linux armv7 gnueabihf"
+    timeout-minutes: 15
+    runs-on: github-ubuntu-24.04-x86_64-8
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: "Install mold"
+        run: ./scripts/install-mold.sh
+
+      - name: "Setup armv7"
+        run: |
+          sudo apt-get update
+          sudo apt-get install gcc-arm-linux-gnueabihf
+          rustup target add armv7-unknown-linux-gnueabihf
+
+      - uses: Swatinem/rust-cache@779680da715d629ac1d338a641029a2f4372abb5 # v2.8.2
+        with:
+          save-if: ${{ inputs.save-rust-cache == 'true' }}
+
+      - name: "Build"
+        env:
+          CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_LINKER: arm-linux-gnueabihf-gcc
+        run: cargo build --profile no-debug --target armv7-unknown-linux-gnueabihf --bin uv --bin uvx
+
+      - name: "Upload binary"
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+        with:
+          name: uv-linux-armv7-gnueabihf-${{ github.sha }}
+          path: |
+            ./target/armv7-unknown-linux-gnueabihf/no-debug/uv
+            ./target/armv7-unknown-linux-gnueabihf/no-debug/uvx
+          retention-days: 1
+
   build-binary-linux-musl:
     name: "linux musl"
     timeout-minutes: 10

.github/workflows/test-integration.yml

@@ -179,6 +179,48 @@ jobs:
         run: |
           ./uv pip install -v anyio
 
+  integration-test-linux-armv7-on-aarch64:
+    name: "armv7 on aarch64 linux"
+    timeout-minutes: 20
+    runs-on: github-ubuntu-24.04-aarch64-4
+    env:
+      UV_PYTHON_INSTALL_DIR: ${{ github.workspace }}/.python
+
+    steps:
+      - name: "Download binary"
+        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
+        with:
+          name: uv-linux-armv7-gnueabihf-${{ inputs.sha }}
+
+      - name: "Install armhf runtime"
+        run: |
+          sudo dpkg --add-architecture armhf
+          sudo apt-get update
+          sudo apt-get install -y libc6:armhf libgcc-s1:armhf
+
+      - name: "Prepare binary"
+        run: |
+          chmod +x ./uv
+          chmod +x ./uvx
+
+      - name: "Install Python via uv"
+        run: |
+          ./uv python install -v 3.13.12
+
+      - name: "Verify hard-float variant selected"
+        run: |
+          python_path=$(./uv python find 3.13)
+          expected="$GITHUB_WORKSPACE/.python/cpython-3.13-linux-armv7-gnueabihf/bin/python3.13"
+          if [[ "$python_path" != "$expected" ]]; then
+            echo "Expected: $expected"
+            echo "Found:    $python_path"
+            exit 1
+          fi
+
+      - name: "Create a virtual environment"
+        run: |
+          ./uv venv -c -p 3.13.12 --managed-python --no-python-downloads
+
   integration-test-free-threaded-windows-x86_64:
     name: "free-threaded on windows"
     timeout-minutes: 10