chore: fixup CI, add format-checking workflow

Author: barjin

.github/workflows/cli-release.yaml

@@ -4,13 +4,12 @@ name: "[impit-cli] Test & Build"
 on:
   push:
     branches:
-      - "**"
+      - "master"
     tags-ignore:
       - "impit-cli-*"
     paths:
       - "impit-cli/**"
       - "impit/**"
-  pull_request:
 
 env:
   CRATE_NAME: impit-cli

.github/workflows/format.yaml

@@ -0,0 +1,35 @@
+name: Check formatting & Clippy
+on:
+  push:
+  pull_request:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: deploy
+  cancel-in-progress: false
+
+jobs:
+  fmt:
+    name: Check code formatting
+    runs-on: ubuntu-latest
+    container: rust:slim
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Install rustfmt
+        run: rustup component add rustfmt
+      - name: Check formatting
+        run: cargo fmt -- --check
+  clippy:
+    name: Check code style
+    runs-on: ubuntu-latest
+    container: rust:slim
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Install clippy
+        run: rustup component add clippy
+      - name: Check style
+        run: cargo clippy -- -D warnings