Move .htaccess to the Dockerfile (and update it)

See https://wordpress.org/support/article/htaccess/ for the latest version of this copy-pasta (not sure how long we've been out of sync).

Author: tianon

Dockerfile.template

@@ -168,6 +168,22 @@ RUN set -eux; \
 	tar -xzf wordpress.tar.gz -C /usr/src/; \
 	rm wordpress.tar.gz; \
 	\
+# https://wordpress.org/support/article/htaccess/
+	[ ! -e /usr/src/wordpress/.htaccess ]; \
+	{ \
+		echo '# BEGIN WordPress'; \
+		echo ''; \
+		echo 'RewriteEngine On'; \
+		echo 'RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]'; \
+		echo 'RewriteBase /'; \
+		echo 'RewriteRule ^index\.php$ - [L]'; \
+		echo 'RewriteCond %{REQUEST_FILENAME} !-f'; \
+		echo 'RewriteCond %{REQUEST_FILENAME} !-d'; \
+		echo 'RewriteRule . /index.php [L]'; \
+		echo ''; \
+		echo '# END WordPress'; \
+	} > /usr/src/wordpress/.htaccess; \
+	\
 	chown -R www-data:www-data /usr/src/wordpress; \
 # pre-create wp-content (and single-level children) for folks who want to bind-mount themes, etc so permissions are pre-created properly instead of root:root
 # wp-content/cache: https://github.com/docker-library/wordpress/issues/534#issuecomment-705733507