Cannot serve directory /var/www/html/: No matching DirectoryIndex (index.php,index.html)

[clockwiser]

After docker up, access to localhost returns error as below.

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Forbidden
You don't have permission to access this resource.

Apache/2.4.48 (Debian) Server at localhost Port 8080

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Log details:
[Thu Oct 07 04:02:38.927782 2021] [autoindex:error] [pid 82] [client 172.20.0.1:49550] AH01276: Cannot serve directory /var/www/html/: No matching DirectoryIndex (index.php,index.html) found, and server-generated directory index forbidden by Options directive

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Problem is that index.php is in /var/www, not in /var/www/html.

Don't know why this happens.

[clockwiser]

Finally found the problem is caused by WORKDIR which was set to /var/www. Changing it to /var/www/html solved problem.
The last command is WORKDIR, and I thought it won't affect the build and up process of docker.

[ladrua]

Ha same issue following these instructions for docker deployment example on docker hub page

FROM wordpress:apache
WORKDIR /usr/src/wordpress
RUN set -eux; \
	find /etc/apache2 -name '*.conf' -type f -exec sed -ri -e "s!/var/www/html!$PWD!g" -e "s!Directory /var/www/!Directory $PWD!g" '{}' +; \
	cp -s wp-config-docker.php wp-config.php
COPY custom-theme/ ./wp-content/themes/custom-theme/
COPY custom-plugin/ ./wp-content/plugins/custom-plugin/

where it tells me to change the workdir, should probably change back workdir or use full paths.