[Feature] Disable unused PHP modules in Docker image

[daberlin]

Is your feature request related to a problem? Please describe.
PHP in the Docker image loads several modules that are not needed and (1) consume memory and (2) enlarge the attack surface security-wise.

Describe the solution you’d like

RUN phpdismod calendar exif ftp gettext gmp iconv intl phar posix readline shmop sockets \
              sysvmsg sysvshm tokenizer xmlreader xmlwriter xsl

Describe alternatives you’ve considered
None

Additional context
None

[Frenzie]

I don't know about all of those but most of them are definitely needed. Strictly speaking some aren't needed in the sense that things will mostly work without but purposefully installing them and then disabling them is a bit backwards. ;-D And yes, I'm pretty sure we do indeed want to also install the optional ones like iconv.

FreshRSS/.devcontainer/Dockerfile

Lines 6 to 12 in 08345d0

	RUN apk add --no-cache \
	tzdata \
	apache2 php-apache2 \
	php php-curl php-gmp php-intl php-mbstring php-xml php-zip \
	php-ctype php-dom php-fileinfo php-iconv php-json php-opcache php-openssl php-phar php-session php-simplexml php-xmlreader php-xmlwriter php-xml php-tokenizer php-zlib \
	php-pdo_sqlite php-pdo_mysql php-pdo_pgsql \
	bash composer curl docker-cli-buildx git gpg make nodejs npm shellcheck shfmt sudo

[Alkarex]

Debian version:

FreshRSS/Docker/Dockerfile

Lines 12 to 13 in 2bd9f63

	php-curl php-gmp php-intl php-mbstring php-xml php-zip \
	php-sqlite3 php-mysql php-pgsql && \

Alpine version:

FreshRSS/Docker/Dockerfile-Alpine

Lines 9 to 11 in 2bd9f63

	php php-curl php-gmp php-intl php-mbstring php-xml php-zip \
	php-ctype php-dom php-fileinfo php-iconv php-json php-opcache php-openssl php-phar php-session php-simplexml php-xmlreader php-xmlwriter php-xml php-tokenizer php-zlib \
	php-pdo_sqlite php-pdo_mysql php-pdo_pgsql

1. As Frenzie is writing already, I do not believe we install any package that we do not need;
2. but we might want to disable some extensions though (especially in Debian, which has more extensions enabled by default)

Concrete PR welcome so we can discuss the details

[Alkarex]

Please check #5994