ci(workflow): refactor and add shmft

.github/workflows/lint.yml

@@ -0,0 +1,26 @@
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+
+name: Lint
+jobs:
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: shellcheck
+      uses: ludeeus/action-shellcheck@0.0.1
+      env:
+        SHELLCHECK_OPTS: -e SC1091,SC1117,SC2001
+  shfmt:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: shfmt
+      uses: bltavares/actions/shfmt@master
+      env:
+        SHFMT_ARGS: -d

.github/workflows/push.yml

@@ -1,13 +0,0 @@
-on: push
-name: ShellCheck
-jobs:
-  shellcheck:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@master
-    - name: shellcheck
-      uses: ludeeus/action-shellcheck@0.0.1
-      env:
-        SHELLCHECK_OPTS: -e SC1091,SC1117,SC2001
-      with:
-        args: wireguard-install.sh