ci: remove cross toolchain

We aren't actually building for these targets, we only use this to pick
the set of generated definitions to use in BPF which is the true target.

.github/workflows/ci.yml

@@ -74,7 +74,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        arch:
+        bpf_target_arch:
           - x86_64-unknown-linux-gnu
           - aarch64-unknown-linux-gnu
           - armv7-unknown-linux-gnueabi
@@ -88,16 +88,11 @@ jobs:
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: stable
-          targets: ${{ matrix.arch }}
 
       - uses: Swatinem/rust-cache@v2
 
       - uses: taiki-e/install-action@cargo-hack
 
-      - uses: taiki-e/setup-cross-toolchain-action@v1
-        with:
-          target: ${{ matrix.arch }}
-
       - name: Build
         run: |
           set -euxo pipefail
@@ -139,7 +134,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        arch:
+        bpf_target_arch:
           - x86_64
           - aarch64
           - arm
@@ -167,7 +162,7 @@ jobs:
       - uses: taiki-e/install-action@cargo-hack
       - name: Build
         env:
-          CARGO_CFG_BPF_TARGET_ARCH: ${{ matrix.arch }}
+          CARGO_CFG_BPF_TARGET_ARCH: ${{ matrix.bpf_target_arch }}
         run: |
           set -euxo pipefail
           cargo hack build --package aya-ebpf --package aya-log-ebpf \
@@ -177,7 +172,7 @@ jobs:
 
       - name: Test
         env:
-          CARGO_CFG_BPF_TARGET_ARCH: ${{ matrix.arch }}
+          CARGO_CFG_BPF_TARGET_ARCH: ${{ matrix.bpf_target_arch }}
           RUST_BACKTRACE: full
         run: |
           set -euxo pipefail