Add basic GitHub Action

Dockerfile

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+FROM alpine:3.19
+
+RUN apk add --no-cache --upgrade \
+    openssh \
+    rsync
+
+ADD deploy.sh /
+RUN chmod +x /deploy.sh
+
+ENTRYPOINT ["/deploy.sh"]

README.md

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+# rsync deploy action
+
+Example usage:
+
+```yaml
+name: 'Build and deploy'
+run-name: 'Build and Deploy'
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy-blog:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout
+      - name: Deploy files
+        uses: https://git.roy.lv/actions/rsync-deploy-action # Full URL is Gitea Actions specific
+        env:
+          SSH_KEY: ${{ secrets.SSH_KEY }}
+          RSYNC_SOURCE: ./*
+          RSYNC_DESTINATION: /path/to/rsync/to/
+          RSYNC_USERHOST: user@example.host
+        with:
+          rsync-arguments: --archive --compress --delete --verbose
+```

action.yml

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+name: Deploy to server with rsync
+description: An action to build and deploy to a server with rsync over SSH
+branding:
+  icon: upload-cloud
+  color: blue
+
+inputs:
+  rsync-arguments:
+    description: Rsync arguments
+    required: false
+    default: --archive --compress --delete --verbose
+
+runs:
+  using: docker
+  image: Dockerfile
+  args:
+    - ${{ inputs.rsync-arguments }}

deploy.sh

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+#!/bin/sh
+
+set -euo pipefail
+
+options="$1"
+SSH_HOME="${HOME}/.ssh"
+SSH_KEYPATH="${SSH_HOME}/deploy_key"
+
+mkdir -p "$SSH_HOME"
+echo "$SSH_KEY" > "$SSH_KEYPATH"
+chmod 600 "$SSH_KEYPATH"
+
+echo "Deploying..."
+rsync $options \
+  -e "ssh -i $SSH_KEYPATH -o StrictHostKeyChecking=no" \
+   "$RSYNC_SOURCE" "$RSYNC_USERHOST":"$RSYNC_DESTINATION"