set up github actions

Author: mazgi

.github/workflows/test-all.yml

@@ -0,0 +1,28 @@
+name: test-all
+
+on:
+  push:
+
+jobs:
+  build-and-test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          - macOS-latest
+          - windows-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --all --all-targets
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --all-features --no-fail-fast

README.md

@@ -1 +1,3 @@
-# openssh-authorizedkeyscommand-github
+# OpenSSH AuthorizedKeysCommand GitHub
+
+![GitHub Actions status for "test-all"](https://github.com/mazgi/openssh-authorizedkeyscommand-github/workflows/test-all/badge.svg)