add helm charts

backing-services/mssql/README.md

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+# Helm chart for Microsoft SQL Server
+
+Microsoft SQL Server is still used by many organizations. And migration to Cloud native can be a blocked by having this technology.
+In order to help organization to lift-shift to Cloud Native, they can run also MS SQL in kubernetes via this Helm chart
+
+> **DISCLAIMER**
+> BY DEPLOYING THIS HELM CHART, YOU ARE ACCEPTING THE [END-USER Licensing Agreement of Microsoft SQL Server](https://github.com/microsoft/mssql-docker/blob/master/LICENSE)
+
+## Install
+
+Verify the helm chart via cosign
+
+```sh
+export COSIGN_PUBLIC_KEY=$(curl https://gitlab.com/xrow.keys | grep rsa | ssh-keygen -f /dev/stdin -e -m pem)
+cosign verify --key env://COSIGN_PUBLIC_KEY registry.gitlab.com/xrow-public/helm-mssql/charts/mssql:1.1.3
+```
+
+values.yaml
+```yaml
+---
+global:
+  storageClass: "openebs-kernel-nfs" # Change this
+
+auth:
+  database: test
+  rootPassword: 'yourStrong(#)Password'
+  username: test
+  password: 'yourStrong(#)Password'
+```
+
+```sh
+helm upgrade --install mssql oci://registry.gitlab.com/xrow-public/helm-mssql/charts/mssql --version 1.1.3 --create-namespace -n mssql -f values.yaml
+```
+
+# values.yaml
+
+Check default values of this chart [here](https://gitlab.com/xrow-public/helm-mssql/-/blob/main/chart/values.yaml) .
+
+# Features
+
+* Applying Helm Chart standards
+* Ability to specify own registry
+* Persisting data
+* Auto Bootstrapping Database
+* Auto Bootstraping Database Owner User with given password
+* Ability to execute initial DB scripts (SQL)
+* Performance Monitoring - Integrated with Prometheus Operator
+
+## Data initalisation via init folder
+
+```Docker
+FROM registry.gitlab.com/xrow-public/helm-mssql:1.1.3
+
+COPY *.sql /docker-entrypoint-initdb.d
+```
+
+## Test the container
+
+```bash
+podman build -t mssql .
+docker run -e 'ACCEPT_EULA=Y' -e 'MSSQL_SA_PASSWORD=<YourStrong#Passw0rd>' -p 1433:1433 -v sqlvolume:/var/opt/mssql -it localhost/mssql:1.1.3
+```
+
+## Credits
+
+Credits to [ElmCompany](https://github.com/ElmCompany/helm-charts/tree/master/charts/mssql) for inital work.