Add github actions

.github/workflows/crystal.yml

@@ -0,0 +1,33 @@
+name: Crystal CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    container:
+      image: crystallang/crystal
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install wget
+      run: sudo apt-get install wget
+    - name: setenv DEBUG
+      run: echo "SODIUM_BUILD_DEBUG=1" >> $GITHUB_ENV
+    - name: setenv BUILD_DIR
+      run: echo "LIBSODIUM_BUILD_DIR=$HOME/libsodium" >> $GITHUB_ENV
+    - name: Install dependencies
+      run: shards install
+    - name: Run tests
+      run: crystal spec -Dpreview_mt --order random --error-on-warnings
+    - name: Run bulid
+      run: shards build -Dpreview_mt
+    - name: Run format
+      run: crystal tool format --check
+

.github/workflows/deploy_docs.yml

@@ -0,0 +1,35 @@
+name: Deploy Docs
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - v*
+    paths-ignore:
+      - "CHANGELOG.md"
+jobs:
+  deploy:
+    runs-on: ubuntu-16.04
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: MeilCli/setup-crystal-action@v4.0.1
+        with:
+          crystal_version: 1.0.0
+          shards_version: 0.14.1
+      - name: Install dependencies
+        run: shards install
+      - name: Run crystal doc
+        run: crystal doc
+      - name: Extract branch name
+        shell: bash
+        run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
+        id: extract_branch
+      - name: Deploy to gh-pages
+        uses: peaceiris/actions-gh-pages@v3.7.0-8
+        with:
+          personal_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: docs
+          destination_dir: ${{ steps.extract_branch.outputs.branch }}
+

README.md

@@ -61,7 +61,6 @@ Crystal bindings for the [libsodium API](https://libsodium.gitbook.io/doc/)
   - [x] Fast.  Benchmarks available in `benchmarks`.
   - [x] [Most classes are safe to share between threads.](THREAD_SAFETY.md)
     - [x] Tested with real crystal threads and will continue to work when crystal officially supports threading.
-  - [x] Most classes are safe to share between threads.  Even
   - [ ] Controlled memory wiping (by calling `.close`)
 
 ☑ Indicate specs are compared against test vectors from another source.