use the bitnami/apache base image because it doesn't use root

Dockerfile

@@ -1,6 +1,7 @@
-FROM httpd:2.4
+FROM bitnami/apache:2.4.55-debian-11-r3@sha256:bbe50190eb3bbf3be6f61318004480b3230846bfd52dec9286bd1862254c1719
 
-RUN echo "Include conf/app-httpd.conf" >> /usr/local/apache2/conf/httpd.conf
-COPY app-httpd.conf /usr/local/apache2/conf/
-COPY build /usr/local/apache2/htdocs/gridXXX
-RUN sed -i -e 's;<base href="\./"/>;<base href="<!--#echo var="BASE" -->"/>;' /usr/local/apache2/htdocs/gridXXX/index.html
+USER root
+COPY app-httpd.conf /opt/bitnami/apache/conf/bitnami/bitnami.conf
+COPY build /opt/bitnami/apache/htdocs/gridXXX
+RUN sed -i -e 's;<base href="\./"/>;<base href="<!--#echo var="BASE" -->"/>;' /opt/bitnami/apache/htdocs/gridXXX/index.html
+USER 1001

app-httpd.conf

@@ -1,4 +1,4 @@
-<VirtualHost *:80>
+<VirtualHost *:8080>
     AllowEncodedSlashes NoDecode
 
     LoadModule proxy_module modules/mod_proxy.so
@@ -8,9 +8,9 @@
     LoadModule include_module modules/mod_include.so
     LoadModule info_module modules/mod_info.so
 
-    DocumentRoot /usr/local/apache2/htdocs/gridXXX/
+    DocumentRoot /opt/bitnami/apache/htdocs/gridXXX/
     AddOutputFilterByType INCLUDES text/html
-    <Directory /usr/local/apache2/htdocs/gridXXX/>
+    <Directory /opt/bitnami/apache/htdocs/gridXXX/>
         Options +Includes
     </Directory>
 
@@ -22,7 +22,7 @@
     RewriteEngine On
     RewriteMap remapbase "prg:/bin/sed -u -e 's;[^ ]* ;;' -e 's;[ ?].*;;' -e 's;[^/]*;..;g' -e 's;../..;;' -e 's/.//' -e 's;^$;.;'"
 
-    RewriteCond /usr/local/apache2/htdocs/gridXXX%{REQUEST_URI} -f [OR]
+    RewriteCond /opt/bitnami/apache/htdocs/gridXXX%{REQUEST_URI} -f [OR]
     RewriteCond %{REQUEST_URI} ^/api/.* [OR]
     RewriteCond %{REQUEST_URI} ^/ws/.*
     RewriteRule ^ - [S=2]