diff --git a/.github/actions/prep-build-env/action.yml b/.github/actions/prep-build-env/action.yml
new file mode 100644
index 00000000..8edaf3b4
--- /dev/null
+++ b/.github/actions/prep-build-env/action.yml
@@ -0,0 +1,13 @@
+name: "Prepare nix build environment"
+runs:
+  using: "composite"
+  steps:
+  - name: Ensure KVM is usable by nix-build
+    run: sudo chmod a+rwx /dev/kvm
+    shell: bash
+  - uses: cachix/install-nix-action@v18
+    with:
+      nix_path: nixpkgs=channel:nixos-unstable
+      extra_nix_config: |
+        system-features = nixos-test benchmark big-parallel kvm
+  - uses: DeterminateSystems/magic-nix-cache-action@v8
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e90847f3..3597f03c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -29,15 +29,8 @@ jobs:
       matrix:
         file: ${{fromJson(needs.prepare-matrix.outputs.integration_tests)}}
     steps:
-    - name: Ensure KVM is usable by nix-build
-      run: sudo chmod a+rwx /dev/kvm
     - uses: actions/checkout@v4
-    - uses: cachix/install-nix-action@v18
-      with:
-        nix_path: nixpkgs=channel:nixos-unstable
-        extra_nix_config: |
-          system-features = nixos-test benchmark big-parallel kvm
-    - uses: DeterminateSystems/magic-nix-cache-action@v8
+    - uses: ./.github/actions/prep-build-env
     - run: NIXPKGS_ALLOW_UNFREE=1 nix-build ${{ matrix.file }}
 
 
@@ -49,15 +42,8 @@ jobs:
       matrix:
         file: ${{fromJson(needs.prepare-matrix.outputs.manual_tests)}}
     steps:
-    - name: Ensure KVM is usable by nix-build
-      run: sudo chmod a+rwx /dev/kvm
     - uses: actions/checkout@v4
-    - uses: cachix/install-nix-action@v18
-      with:
-        nix_path: nixpkgs=channel:nixos-unstable
-        extra_nix_config: |
-          system-features = nixos-test benchmark big-parallel kvm
-    - uses: DeterminateSystems/magic-nix-cache-action@v8
+    - uses: ./.github/actions/prep-build-env
     - run: NIXPKGS_ALLOW_UNFREE=1 nix-build -A driverInteractive ${{ matrix.file }}
 
 
@@ -65,46 +51,27 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - uses: cachix/install-nix-action@v18
-      with:
-        nix_path: nixpkgs=channel:nixos-unstable
-        extra_nix_config: |
-          system-features = nixos-test benchmark big-parallel kvm
-    - uses: DeterminateSystems/magic-nix-cache-action@v8
+    - uses: ./.github/actions/prep-build-env
     - run: cd kiosk && nix-shell --run bin/test
 
   build-vm:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - uses: cachix/install-nix-action@v18
-      with:
-        nix_path: nixpkgs=channel:nixos-unstable
-        extra_nix_config: |
-          system-features = nixos-test benchmark big-parallel kvm
-    - uses: DeterminateSystems/magic-nix-cache-action@v8
+    - uses: ./.github/actions/prep-build-env
     - run: NIXPKGS_ALLOW_UNFREE=1 ./build vm
 
   e2e-tests:
     runs-on: ubuntu-latest
     steps:
+    - uses: actions/checkout@v4
+    - uses: ./.github/actions/prep-build-env
     - name: Make more space available on the runner
       run: |
         sudo rm -rf /usr/share/dotnet \
                     /usr/local/lib/android \
                     /opt/ghc \
                     /opt/hostedtoolcache/CodeQL
-
-    - name: Ensure KVM is usable by nix-build
-      run: sudo chmod a+rwx /dev/kvm
-
-    - uses: actions/checkout@v4
-    - uses: cachix/install-nix-action@v18
-      with:
-        nix_path: nixpkgs=channel:nixos-unstable
-        extra_nix_config: |
-          system-features = nixos-test benchmark big-parallel kvm
-    - uses: DeterminateSystems/magic-nix-cache-action@v8
     - name: Make magic-nix-cache read-only by removing post-build-hook
       run: sed -i '/post-build-hook = magic-nix-cache-build-hook/d' $HOME/.config/nix/nix.conf
     - run: ./build test-e2e
@@ -116,22 +83,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - uses: cachix/install-nix-action@v18
-      with:
-        nix_path: nixpkgs=channel:nixos-unstable
-        extra_nix_config: |
-          system-features = nixos-test benchmark big-parallel kvm
-    - uses: DeterminateSystems/magic-nix-cache-action@v8
+    - uses: ./.github/actions/prep-build-env
     - run: cd controller && nix-shell --run 'bin/test --force --no-buffer'
 
   ocaml-formatting:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - uses: cachix/install-nix-action@v18
-      with:
-        nix_path: nixpkgs=channel:nixos-unstable
-        extra_nix_config: |
-          system-features = nixos-test benchmark big-parallel kvm
-    - uses: DeterminateSystems/magic-nix-cache-action@v8
+    - uses: ./.github/actions/prep-build-env
     - run: cd controller && nix-shell --run 'dune build @fmt'