convert main.workflow to Actions V2 yml file

.github/main.workflow

@@ -1,9 +0,0 @@
-workflow "ShellCheck" {
-  on = "push"
-  resolves = ["shellcheck"]
-}
-
-action "shellcheck" {
-  uses = "actions/bin/shellcheck@master"
-  args = "wireguard-install.sh -e SC1091 -e SC2034"
-}

.github/workflows/push.yml

@@ -0,0 +1,11 @@
+on: push
+name: ShellCheck
+jobs:
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: shellcheck
+      uses: actions/bin/shellcheck@master
+      with:
+        args: wireguard-install.sh -e SC1091 -e SC2034