[Snyk] Security upgrade nginx from alpine to 1-alpine

[snyk-bot]

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• webapp/Dockerfile.prod

We recommend upgrading to nginx:1-alpine, as this image has only 1 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	471	Use After Free SNYK-ALPINE316-BUSYBOX-2953070	No Known Exploit
	571	Incorrect Default Permissions SNYK-ALPINE316-CURL-2938013	No Known Exploit
	571	Incorrect Default Permissions SNYK-ALPINE316-CURL-2938013	No Known Exploit
	567	Inadequate Encryption Strength SNYK-ALPINE316-OPENSSL-2941806	No Known Exploit
	567	Inadequate Encryption Strength SNYK-ALPINE316-OPENSSL-2941806	No Known Exploit

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[codecov[bot]]

Codecov Report

Merging #72 (01c683c) into dev-2.0 (8cf68d8) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           dev-2.0      #72   +/-   ##
========================================
  Coverage    79.71%   79.71%           
========================================
  Files           18       18           
  Lines          276      276           
========================================
  Hits           220      220           
  Misses          56       56           

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