Add linux-headers to Dockerfile

Author: ildus

Dockerfile.tmpl

@@ -2,10 +2,12 @@ FROM postgres:${PG_VERSION}-alpine
 
 ENV PYTHON=python${PYTHON_VERSION}
 RUN if [ "${PYTHON_VERSION}" = "2" ] ; then \
-	apk add --no-cache curl python2 python2-dev build-base musl-dev py-virtualenv py-pip; \
+	apk add --no-cache curl python2 python2-dev build-base musl-dev \
+    linux-headers py-virtualenv py-pip; \
 	fi
 RUN if [ "${PYTHON_VERSION}" = "3" ] ; then \
-	apk add --no-cache curl python3 python3-dev build-base musl-dev py-virtualenv; \
+	apk add --no-cache curl python3 python3-dev build-base musl-dev \
+    linux-headers py-virtualenv; \
 	fi
 ENV LANG=C.UTF-8