Build and copy builds artifacts to S3

Resolves #7

Author: ImeevOchir

.github/workflows/deploy-branch.yml

@@ -0,0 +1,23 @@
+name: Deploy-branch
+
+on:
+  pull_request:
+jobs:
+  deploy-branch:
+    runs-on: ['self-hosted', 'Linux', 'flavor-8-16']
+    container: tarantool/doc-builder:slim-4.2
+    env:
+      AWS_ACCESS_KEY_ID: ${{secrets.AWS_ACCESS_KEY_ID}}
+      AWS_SECRET_ACCESS_KEY: ${{secrets.AWS_SECRET_ACCESS_KEY}}
+      AWS_DEFAULT_REGION: ${{secrets.AWS_DEFAULT_REGION}}
+      ENDPOINT_URL: ${{secrets.ENDPOINT_URL}}
+      S3_UPLOAD_PATH: ${{secrets.S3_UPLOAD_PATH}}
+      S3_BUCKET: ${{secrets.S3_BUCKET}}
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set branch name from source branch
+        run: echo "BRANCH_NAME=${GITHUB_HEAD_REF##*/}" >> $GITHUB_ENV
+
+      - run: sphinx-build -b json source -d build/.doctrees build/json
+      - run: bash upload_output.sh