fix: docker-examples/v4/reverse_proxy/nginx/relative_path/nginx_ssl/D…

…ockerfile to reduce vulnerabilities (verdaccio#2416)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN10-GLIBC-1315333
- https://snyk.io/vuln/SNYK-DEBIAN10-OPENSSL-1569403
- https://snyk.io/vuln/SNYK-DEBIAN10-OPENSSL-1569403
- https://snyk.io/vuln/SNYK-DEBIAN10-OPENSSL-1569406
- https://snyk.io/vuln/SNYK-DEBIAN10-OPENSSL-1569406

docker-examples/v4/reverse_proxy/nginx/relative_path/nginx_ssl/Dockerfile

@@ -1,4 +1,4 @@
-FROM nginx
+FROM nginx:1
 
 COPY cert.crt /etc/nginx/cert.crt
 COPY cert.key /etc/nginx/cert.key