Add deploying GitHub Action (#1)

.github/workflows/main.yml

@@ -0,0 +1,50 @@
+on: [push]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    name: Deploy blog to hydrogen
+    env:
+      MACHINE: hydrogen
+    steps:
+    - name: Setup Go 1.16
+      id: go
+      uses: actions/setup-go@v2
+      with:
+        go-version: '^1.16'
+    - name: Setup Tailscale
+      id: tailscale
+      uses: tailscale/tailscale-deploy-github@main
+      with:
+        authkey: ${{ secrets.TAILSCALE_AUTHKEY }}
+        version: 1.7.359
+    - name: Add SSH key
+      id: ssh
+      env:
+        SSH_KEY: ${{ secrets.SSH_KEY }}
+      run: |
+        mkdir -p ~/.ssh
+        MACHINE_IP="$(tailscale ip -6 $MACHINE)"
+        ssh-keyscan $MACHINE_IP >> ~/.ssh/known_hosts
+        printf "%s" "$SSH_KEY" > ~/.ssh/key
+        chmod 600 ~/.ssh/key
+
+    - name: Fetch code
+      id: fetch
+      uses: actions/checkout@v1
+
+    - name: Compile blog binary
+      id: compile
+      run: go build -o prose .
+
+    - name: Build tarball and ship it
+      id: tarball
+      run: |
+        TIME=$(date +%Y%m%d-%H%M%S)
+        FILENAME=prose-${TIME}.tar.gz
+        mkdir -p static/css
+        tar -czf $FILENAME prose static/ styles/ templates/ posts/
+        MACHINE_IP="$(tailscale ip -6 $MACHINE)"
+        echo $FILENAME "github@[$MACHINE_IP]:/home/github/"
+        scp -i ~/.ssh/key $FILENAME "github@[$MACHINE_IP]:/home/github/"
+        ssh -i ~/.ssh/key "github@$MACHINE_IP" "mkdir -p ~/prose && tar -C ~/prose -xzf ~/$FILENAME"