fix: Correct vulnerabilities found through static code analysis

* Dockerfile
 * Changes http to https
 * Change use of pipes to avoid pipefail messages

Dockerfile

@@ -36,7 +36,7 @@ LABEL url="https://www.nginx.com/" \
 
 COPY docker/nginx.repo /etc/yum.repos.d/nginx.repo
 
-RUN curl -sO http://nginx.org/keys/nginx_signing.key && \
+RUN curl -sO https://nginx.org/keys/nginx_signing.key && \
     rpm --import ./nginx_signing.key && \
     microdnf -y install --setopt=tsflags=nodocs nginx-${NGINX_VERSION}.ngx nginx-module-njs-${NGINX_MODULE_NJS_VERSION}.ngx && \
     rm -f ./nginx_signing.key && \
@@ -47,11 +47,11 @@ RUN curl -sO http://nginx.org/keys/nginx_signing.key && \
 # - modify perms for non-root runtime
 RUN ln -sf /dev/stdout /var/log/nginx/access.log && \
     ln -sf /dev/stderr /var/log/nginx/error.log && \
-    sed -i 's|/var/run/nginx.pid|/var/cache/nginx/nginx.pid|g' /etc/nginx/nginx.conf && \
+    sed -i 's~/var/run/nginx.pid~/var/cache/nginx/nginx.pid~g' /etc/nginx/nginx.conf && \
     sed -i -e '/user/!b' -e '/nginx/!b' -e '/nginx/d' /etc/nginx/nginx.conf && \
     echo -e "load_module modules/ngx_http_js_module.so;\n$(cat /etc/nginx/nginx.conf)" > /etc/nginx/nginx.conf && \
     # Uncomment this line to output info log for nginx.js
-    sed -i 's|/var/log/nginx/error.log warn|/var/log/nginx/error.log info|g' /etc/nginx/nginx.conf && \
+    sed -i 's~/var/log/nginx/error.log warn~/var/log/nginx/error.log info~g' /etc/nginx/nginx.conf && \
     chown -R 998 /var/cache/nginx /etc/nginx && \
     rm -f /etc/nginx/conf.d/default.conf && \
     chmod -R g=u /var/cache/nginx /etc/nginx