rename CI files

.github/workflows/ci-nix.yml

@@ -0,0 +1,19 @@
+name: "CI Nix"
+on:
+  pull_request:
+  push:
+jobs:
+  check:
+    name: Rust project
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2.3.4
+    - uses: cachix/install-nix-action@v13
+      with:
+        install_url: https://nixos-nix-install-tests.cachix.org/serve/lb41az54kzk6j12p81br4bczary7m145/install
+        install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'
+        extra_nix_config: |
+          experimental-features = nix-command flakes
+    - run: nix develop -c rustc --version
+    - run: nix run . -- ping
+    - run: nix-build

.github/workflows/ci.yml

@@ -1,18 +1,24 @@
-name: "CI"
-on:
-  pull_request:
-  push:
+on: [push]
+
+name: CI
+
 jobs:
-  build:
+  check:
+    name: Rust project
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.4
-    - uses: cachix/install-nix-action@v13
-      with:
-        install_url: https://nixos-nix-install-tests.cachix.org/serve/lb41az54kzk6j12p81br4bczary7m145/install
-        install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'
-        extra_nix_config: |
-          experimental-features = nix-command flakes
-    - run: nix develop -c rustc --version
-    - run: nix run . -- ping
-    - run: nix-build
+      - uses: actions/checkout@v2
+      - name: Install latest nightly
+        uses: actions-rs/toolchain@v1
+        with:
+            toolchain: nightly
+            override: true
+            components: rustfmt, clippy
+
+      # `cargo check` command here will use installed `nightly`
+      # as it is set as an "override" for current directory
+
+      - name: Run cargo check
+        uses: actions-rs/cargo@v1
+        with:
+          command: check

.github/workflows/ci2.yml

@@ -1,24 +0,0 @@
-on: [push]
-
-name: build
-
-jobs:
-  check:
-    name: Rust project
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - name: Install latest nightly
-        uses: actions-rs/toolchain@v1
-        with:
-            toolchain: nightly
-            override: true
-            components: rustfmt, clippy
-
-      # `cargo check` command here will use installed `nightly`
-      # as it is set as an "override" for current directory
-
-      - name: Run cargo check
-        uses: actions-rs/cargo@v1
-        with:
-          command: check