Add github action for auto committing docs

Author: sudormrfbin

.github/workflows/docs.yml

@@ -0,0 +1,51 @@
+name: Docs
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  docs:
+    name: Docs
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2
+        with:
+          submodules: true
+
+      - name: Install stable toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: rustfmt, clippy
+
+      - name: Cache cargo registry
+        uses: actions/[email protected]
+        with:
+          path: ~/.cargo/registry
+          key: ${{ runner.os }}-v2-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Cache cargo index
+        uses: actions/[email protected]
+        with:
+          path: ~/.cargo/git
+          key: ${{ runner.os }}-v2-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Cache cargo target dir
+        uses: actions/[email protected]
+        with:
+          path: target
+          key: ${{ runner.os }}-v2-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Generate docs
+        uses: actions-rs/cargo@v1
+        with:
+          command: xtask
+          args: docgen
+
+      - uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: "docs: Auto generate from source"