BRE-917 Update to Alpine base (#5976)

* testing-wolfi

* testing alpine

* fix gosu download

* fix Admin dockerfile

* update dockerfiles

* alpine-compatible-entrypoint-script-for-api-test

* make-entrypoint-scripts-alpine-compatible

* testing nginx with alpine

* cleaning up comments from dockerfile from testing

* restore accidentally deleted icon

* remove unused file

* pin alpine, update apk add no cache

* remove comments from testing

* test shadow implementtaion for entrypoints

* add shadow package, revert entrypoints, change from bash to shell for entry

* add icu to setup container, update helpers to use shell

* update migrator utility

* add missing krb5 libraries

util/Setup/Dockerfile

@@ -1,7 +1,7 @@
 ###############################################
 #                 Build stage                 #
 ###############################################
-FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/sdk:8.0-alpine AS build
 
 # Docker buildx supplies the value for this arg
 ARG TARGETPLATFORM
@@ -9,11 +9,11 @@ ARG TARGETPLATFORM
 # Determine proper runtime value for .NET
 # We put the value in a file to be read by later layers.
 RUN if [ "$TARGETPLATFORM" = "linux/amd64" ]; then \
-    RID=linux-x64 ; \
+    RID=linux-musl-x64 ; \
     elif [ "$TARGETPLATFORM" = "linux/arm64" ]; then \
-    RID=linux-arm64 ; \
+    RID=linux-musl-arm64 ; \
     elif [ "$TARGETPLATFORM" = "linux/arm/v7" ]; then \
-    RID=linux-arm ; \
+    RID=linux-musl-arm ; \
     fi \
     && echo "RID=$RID" > /tmp/rid.txt
 
@@ -38,18 +38,18 @@ RUN . /tmp/rid.txt && dotnet publish \
 ###############################################
 #                  App stage                  #
 ###############################################
-FROM mcr.microsoft.com/dotnet/aspnet:8.0
+FROM mcr.microsoft.com/dotnet/aspnet:8.0-alpine
 
 ARG TARGETPLATFORM
 LABEL com.bitwarden.product="bitwarden" com.bitwarden.project="setup"
-
 ENV SSL_CERT_DIR=/etc/bitwarden/ca-certificates
+ENV DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=false
 
-RUN apt-get update \
-    && apt-get install -y --no-install-recommends \
+RUN apk add --no-cache curl \
     openssl \
-    gosu \
-    && rm -rf /var/lib/apt/lists/*
+    icu-libs \
+    shadow \
+    && apk add --no-cache --repository=http://dl-cdn.alpinelinux.org/alpine/edge/community gosu
 
 # Copy app from the build stage
 WORKDIR /app

util/Setup/Helpers.cs

@@ -128,7 +128,7 @@ public static class Helpers
         if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
         {
             var escapedArgs = cmd.Replace("\"", "\\\"");
-            process.StartInfo.FileName = "/bin/bash";
+            process.StartInfo.FileName = "/bin/sh";
             process.StartInfo.Arguments = $"-c \"{escapedArgs}\"";
         }
         else

util/Setup/entrypoint.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 # Setup