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/Nginx/Dockerfile

@@ -1,15 +1,13 @@
-FROM --platform=$BUILDPLATFORM nginx:stable
+FROM --platform=$BUILDPLATFORM nginx:stable-alpine3.21
 
 ARG TARGETPLATFORM
 LABEL com.bitwarden.product="bitwarden"
 
 ENV SSL_CERT_DIR=/etc/bitwarden/ca-certificates
 
-RUN apt-get update \
-    && apt-get install -y --no-install-recommends \
-    gosu \
-    curl \
-    && rm -rf /var/lib/apt/lists/*
+RUN apk add --no-cache curl \
+    shadow \
+    && apk add --no-cache --repository=http://dl-cdn.alpinelinux.org/alpine/edge/community gosu 
 
 COPY util/Nginx/nginx.conf /etc/nginx
 COPY util/Nginx/proxy.conf /etc/nginx