Switch Dockerfile-openresty base to openresty:latest and replace Alpine with Debian dependencies.

Dockerfile-openresty

@@ -1,6 +1,11 @@
-FROM openresty/openresty
+FROM openresty/openresty:latest
 
-RUN apk add --no-cache git curl luarocks \
+RUN apt-get update && \
-  && luarocks install lua-resty-openidc \
+    apt-get install -y --no-install-recommends \
-  && luarocks install lua-resty-session \
+        git \
-  && luarocks install lua-cjson
+        curl \
+        luarocks && \
+    luarocks install lua-resty-openidc && \
+    luarocks install lua-resty-session && \
+    luarocks install lua-cjson && \
+    rm -rf /var/lib/apt/lists/*