Remove armv7 Android target and limit CI parallelism

Removed armv7-linux-androideabi build target from both the Nix flake
and GitHub Actions workflow. This 32-bit ARM target is increasingly
rare on modern Android devices.

Added max-parallel: 3 to the Linux build matrix to reduce concurrent
jobs hitting the GitHub Actions Cache, which was causing Magic Nix
Cache throttling errors (HTTP 418).

Author: amackillop

.github/workflows/nix.yml

@@ -43,6 +43,7 @@ jobs:
     needs: check
     strategy:
       fail-fast: false
+      max-parallel: 3
       matrix:
         target:
           - x86_64_unknown_linux_gnu
@@ -86,7 +87,6 @@ jobs:
       matrix:
         target:
           - aarch64_linux_android
-          - armv7_linux_androideabi
     steps:
       - uses: actions/checkout@v4
 

flake.nix

@@ -193,7 +193,6 @@
             ndkPrefix =
               {
                 "aarch64-linux-android" = "aarch64-linux-android";
-                "armv7-linux-androideabi" = "armv7a-linux-androideabi";
               }
               .${target};
 
@@ -204,10 +203,6 @@
                   lower = "aarch64_linux_android";
                   upper = "AARCH64_LINUX_ANDROID";
                 };
-                "armv7-linux-androideabi" = {
-                  lower = "armv7_linux_androideabi";
-                  upper = "ARMV7_LINUX_ANDROIDEABI";
-                };
               }
               .${target};
 
@@ -301,12 +296,6 @@
             target = "aarch64-linux-android";
             nodeName = "lightning-js.android-arm64.node";
           };
-
-          # Android ARMv7 (older 32-bit devices)
-          armv7_linux_androideabi = mkAndroidPackage {
-            target = "armv7-linux-androideabi";
-            nodeName = "lightning-js.android-arm-eabi.node";
-          };
         };
 
         devShells.default = pkgs.mkShell {