Fix Build in POSIX Shell

Author: burak-tb

deploy.php

@@ -33,17 +33,17 @@
 
 # Install the requirements
 task('python:venv:requirements', static function () {
-    run('source .venv/bin/activate && pip install -r requirements/base.txt');
+    run('. .venv/bin/activate && pip install -r requirements/base.txt');
 });
 
 task('python:generate_redirects', static function () {
     run('mkdir -p etc/nginx');
-    run('source .venv/bin/activate && bin/generate_nginx_redirects > etc/nginx/server.redirects.conf');
+    run('. .venv/bin/activate && bin/generate_nginx_redirects > etc/nginx/server.redirects.conf');
 });
 
 # Build the documentation
 task('python:build_documentation', static function () {
-    run('source .venv/bin/activate && bin/build_docs');
+    run('. .venv/bin/activate && bin/build_docs');
     run('ln -sf docs/_build/html pub');
 });