Replace raw environment variable reads with IConfiguration in backend

web/backend/Database/Database.Migrations/Database.Migrations.csproj

@@ -11,6 +11,11 @@
     <ItemGroup>
         <PackageReference Include="dbup" Version="5.0.41" />
         <PackageReference Include="Microsoft.Data.SqlClient" Version="7.0.2" />
+        <PackageReference Include="Microsoft.Extensions.Configuration" Version="9.0.0" />
+        <PackageReference
+            Include="Microsoft.Extensions.Configuration.EnvironmentVariables"
+            Version="9.0.0"
+        />
     </ItemGroup>
     <ItemGroup>
         <ProjectReference Include="..\..\Infrastructure\Infrastructure.Sql\Infrastructure.Sql.csproj" />

web/backend/Database/Database.Migrations/Program.cs

@@ -4,13 +4,14 @@ using DbUp;
 using DbUp.Engine;
 using Infrastructure.Sql;
 using Microsoft.Data.SqlClient;
+using Microsoft.Extensions.Configuration;
 
 namespace Database.Migrations;
 
 /// <summary>
-///     Entry point for the database migration runner. Reads connection details from environment
-///     variables, optionally drops and recreates the target database, and applies all SQL
-///     migration scripts embedded in this assembly using DbUp.
+///     Entry point for the database migration runner. Reads connection details from configuration
+///     (backed by environment variables), optionally drops and recreates the target database, and
+///     applies all SQL migration scripts embedded in this assembly using DbUp.
 /// </summary>
 public static class Program
 {
@@ -27,7 +28,10 @@ public static class Program
 
         try
         {
-            DatabaseSettings settings = DatabaseSettings.FromEnvironment();
+            IConfiguration configuration = new ConfigurationBuilder()
+                .AddEnvironmentVariables()
+                .Build();
+            DatabaseSettings settings = DatabaseSettings.FromConfiguration(configuration);
 
             if (settings.ClearDatabase)
             {
@@ -159,28 +163,28 @@ public static class Program
         /// <summary>
         ///     Builds the settings from the <c>DB_SERVER</c>, <c>DB_NAME</c>, <c>DB_USER</c>,
         ///     <c>DB_PASSWORD</c>, <c>DB_TRUST_SERVER_CERTIFICATE</c>, and <c>CLEAR_DATABASE</c>
-        ///     environment variables.
+        ///     configuration values.
         /// </summary>
         /// <exception cref="InvalidOperationException">
-        ///     Thrown when a required environment variable is not set.
+        ///     Thrown when a required configuration value is not set.
         /// </exception>
-        public static DatabaseSettings FromEnvironment()
+        public static DatabaseSettings FromConfiguration(IConfiguration configuration)
         {
             string databaseName =
-                Environment.GetEnvironmentVariable("DB_NAME")
+                configuration["DB_NAME"]
                 ?? throw new InvalidOperationException(
                     "The DB_NAME environment variable is not set."
                 );
 
             bool clearDatabase = string.Equals(
-                Environment.GetEnvironmentVariable("CLEAR_DATABASE"),
+                configuration["CLEAR_DATABASE"],
                 "true",
                 StringComparison.OrdinalIgnoreCase
             );
 
             return new DatabaseSettings(
-                SqlConnectionStringHelper.BuildConnectionString(databaseName),
-                SqlConnectionStringHelper.BuildMasterConnectionString(),
+                SqlConnectionStringHelper.BuildConnectionString(configuration, databaseName),
+                SqlConnectionStringHelper.BuildMasterConnectionString(configuration),
                 databaseName,
                 clearDatabase
             );

web/backend/Database/Database.Seed/DatabaseHelpers/ConnectionStrings.cs

@@ -1,6 +1,7 @@
 #region
 
 using Infrastructure.Sql;
+using Microsoft.Extensions.Configuration;
 
 #endregion
 
@@ -8,7 +9,9 @@ namespace Database.Seed.DatabaseHelpers;
 
 public class ConnectionStrings
 {
-    public static string SqlServerConnectionString => SqlConnectionStringHelper.BuildConnectionString();
+    public static string GetSqlServerConnectionString(IConfiguration configuration) =>
+        SqlConnectionStringHelper.BuildConnectionString(configuration);
+
     public static string SqliteConnectionString =>
         "Data Source=SeedData/biergarten_seed_2026-07-20T05-46-02.993511Z.sqlite";
 }

web/backend/Database/Database.Seed/Program.cs

@@ -22,9 +22,12 @@ static async Task<int> RunAsync()
 {
     try
     {
+        IConfiguration configuration = new ConfigurationBuilder()
+            .AddEnvironmentVariables()
+            .Build();
+
         ServiceCollection services = [];
-        services.AddSingleton<IConfiguration>(
-            new ConfigurationBuilder().Build());
+        services.AddSingleton(configuration);
         services.AddInfrastructureSql();
         services.AddFeaturesBreweries();
         services.AddFeaturesLocations();