Merge pull request #4022 from shaedrich/infrastructure-as-code

Add topic "Infrastructure as code"

topics/infrastructure-as-code/index.md

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+---
+aliases: iac
+display_name: Infrastructure as code
+short_description: Infrastructure as code is a way to manage environment packages as code instead of manual installation and mantainance.
+related: cloud-computing, devops, containerization, as-code, everything-as-code, container-orchestration, infrastructure-as-a-service, provisioning, infrastructure-drift
+topic: infrastructure-as-code
+wikipedia_url: https://en.wikipedia.org/wiki/Infrastructure_as_code
+---
+Nowadays, developers strive to have as identical environments for production, staging and development as possible to rule out any infrastructure interferance. Therefore, instead of installing and maintaining packages manually, **infrastructure** is defined and managed **as code**. Container orchestration solutions and version control systems help keeping all environments in sync and changes transparent.