added debian 9 and 10 and removed 7

debian-9/Dockerfile

@@ -0,0 +1,21 @@
+FROM debian:9
+
+RUN apt-get -q update \
+    && apt-get -yq install --no-install-recommends \
+      build-essential \
+      libffi-dev \
+      libssl-dev \
+      python3 \
+      python3-dev \
+      python3-pip \
+      git \
+      apt-utils \
+      curl \
+      ansible \
+    && curl -L https://github.com/aelsabbahy/goss/releases/latest/download/goss-linux-amd64 -o /usr/local/bin/goss \
+    && chmod +rx /usr/local/bin/goss \
+    && apt-get clean \
+    && pip3 install --upgrade pip
+
+
+CMD ["ansible-playbook", "--help"]