Add option to delete the database when deleting the CRD

[kevin-messer-jemmic]

Description

In this PR, support has been added to delete the database when deleting the CRD.

It is similar to what https://cloudnative-pg.io/documentation/current/declarative_database_management/#deleting-a-database is doing.

Related Issue(s)

• Fixes [Feature]: Add option to delete the database when deleting the CRD #25

Checklist

• I have tested my changes locally.
• My code follows the project's coding guidelines.
• I have updated documentation, if needed.

Screenshots

N/A

Additional context

Dockerfile has been modified as well since I had this error while trying to build the dockerfile locally:

[+] Building 1.0s (11/21)                                                                                                                                                                                                                               docker:default
 => [internal] load build definition from Containerfile                                                                                                                                                                                                           0.0s
 => => transferring dockerfile: 1.04kB                                                                                                                                                                                                                            0.0s
 => [internal] load metadata for mcr.microsoft.com/dotnet/aspnet:10.0                                                                                                                                                                                             0.1s
 => [internal] load metadata for mcr.microsoft.com/dotnet/sdk:10.0                                                                                                                                                                                                0.0s
 => [internal] load .dockerignore                                                                                                                                                                                                                                 0.0s
 => => transferring context: 2B                                                                                                                                                                                                                                   0.0s
 => [build  1/11] FROM mcr.microsoft.com/dotnet/sdk:10.0                                                                                                                                                                                                          0.0s
 => [final 1/5] FROM mcr.microsoft.com/dotnet/aspnet:10.0@sha256:7c4246c1c384319346d45b3e24a10a21d5b6fc9b36a04790e1588148ff8055b0                                                                                                                                 0.0s
 => [internal] load build context                                                                                                                                                                                                                                 0.0s
 => => transferring context: 16.87kB                                                                                                                                                                                                                              0.0s
 => CACHED [build  2/11] WORKDIR /operator                                                                                                                                                                                                                        0.0s
 => [build  3/11] COPY . .                                                                                                                                                                                                                                        0.0s
 => [build  4/11] WORKDIR /operator/src/OperatorTemplate.Operator                                                                                                                                                                                                 0.1s
 => ERROR [build  5/11] RUN dotnet restore                                                                                                                                                                                                                        0.7s
------                                                                                                                                                                                                                                                                 
 > [build  5/11] RUN dotnet restore:
0.702 MSBUILD : error MSB1003: Specify a project or solution file. The current working directory does not contain a project or solution file.
------
Containerfile:10
--------------------
   8 |     # Restore dependencies and build the operator
   9 |     WORKDIR /operator/src/OperatorTemplate.Operator
  10 | >>> RUN dotnet restore
  11 |     RUN curl -L -o cfssl https://github.com/cloudflare/cfssl/releases/download/v1.5.0/cfssl_1.5.0_linux_amd64
  12 |     RUN curl -L -o cfssljson https://github.com/cloudflare/cfssl/releases/download/v1.5.0/cfssljson_1.5.0_linux_amd64
--------------------
ERROR: failed to solve: process "/bin/sh -c dotnet restore" did not complete successfully: exit code: 1