.github: Remove Nix matrix

.github/workflows/build.yml

@@ -11,11 +11,8 @@ jobs:
             image: ubuntu-latest
           - label: macOS
             image: macos-12
-        nix:
-          - version: 2.13.2
-            url: https://releases.nixos.org/nix/nix-2.13.2/install
 
-    name: ${{ matrix.os.label }} + Nix ${{ matrix.nix.version }}
+    name: ${{ matrix.os.label }}
     runs-on: ${{ matrix.os.image }}
     steps:
       - uses: actions/checkout@v3.3.0
@@ -31,11 +28,9 @@ jobs:
 
       - name: Build Colmena
         run: nix build -L
-        if: ${{ !contains(matrix.nix.version, '2.3') }}
 
       - name: Build and install Colmena with flake-compat
         run: nix-env -if default.nix
 
       - name: Build manual
         run: nix build .#manual -L
-        if: ${{ !contains(matrix.nix.version, '2.3') && runner.os != 'macOS' }}

.github/workflows/linters.yml

@@ -9,12 +9,6 @@ jobs:
 
     runs-on: ubuntu-latest
 
-    strategy:
-      matrix:
-        nix:
-          - version: 2.13.2
-            url: https://releases.nixos.org/nix/nix-2.13.2/install
-
     steps:
       - uses: actions/checkout@v3.3.0
 

.github/workflows/manual-stable.yml

@@ -15,12 +15,6 @@ jobs:
     runs-on: ubuntu-latest
     if: github.repository == 'zhaofengli/colmena'
 
-    strategy:
-      matrix:
-        nix:
-          - version: 2.13.2
-            url: https://releases.nixos.org/nix/nix-2.13.2/install
-
     steps:
       - uses: actions/checkout@v3.3.0
 

.github/workflows/manual.yml

@@ -15,12 +15,6 @@ jobs:
     runs-on: ubuntu-latest
     if: github.repository == 'zhaofengli/colmena'
 
-    strategy:
-      matrix:
-        nix:
-          - version: 2.13.2
-            url: https://releases.nixos.org/nix/nix-2.13.2/install
-
     steps:
       - uses: actions/checkout@v3.3.0
 

.github/workflows/tests.yml

@@ -9,15 +9,8 @@ jobs:
         os:
           - label: Linux
             image: ubuntu-latest
-        nix:
-          - version: 2.3.16
-            url: https://releases.nixos.org/nix/nix-2.3.16/install
-          - version: 2.4
-            url: https://releases.nixos.org/nix/nix-2.4/install
-          - version: 2.13.2
-            url: https://releases.nixos.org/nix/nix-2.13.2/install
 
-    name: ${{ matrix.os.label }} + Nix ${{ matrix.nix.version }}
+    name: ${{ matrix.os.label }}
     runs-on: ${{ matrix.os.image }}
     steps:
       - uses: actions/checkout@v3.3.0
@@ -37,6 +30,3 @@ jobs:
         run: echo "NIX_PATH=nixpkgs=$(nix-instantiate --eval flake-compat.nix -A defaultNix.inputs.nixpkgs.outPath | sed 's|\"||g')" >> $GITHUB_ENV
 
       - run: nix-shell --run "cargo test"
-        if: ${{ !contains(matrix.nix.version, '2.3') }}
-      - run: nix-shell --run "cargo test -- --skip flake"
-        if: ${{ contains(matrix.nix.version, '2.3') }}