Add Alpine variant to Dockerfile examples

Signed-off-by: J0WI <J0WI@users.noreply.github.com>

.examples/dockerfiles/full/fpm-alpine/Dockerfile

@@ -0,0 +1,52 @@
+FROM nextcloud:fpm-alpine
+
+RUN set -ex; \
+    \
+    apk add --no-cache \
+        ffmpeg \
+        samba-client \
+        supervisor \
+#       libreoffice \
+    ;
+
+RUN set -ex; \
+    \
+    apk add --no-cache --virtual .build-deps \
+        $PHPIZE_DEPS \
+        imap-dev \
+        krb5-dev \
+        libressl-dev \
+        samba-dev \
+        bzip2-dev \
+        gmp-dev \
+    ; \
+    \
+    docker-php-ext-configure imap --with-kerberos --with-imap-ssl; \
+    docker-php-ext-install \
+        bz2 \
+        gmp \
+        imap \
+    ; \
+    pecl install smbclient; \
+    docker-php-ext-enable smbclient; \
+    \
+    runDeps="$( \
+        scanelf --needed --nobanner --format '%n#p' --recursive /usr/local/lib/php/extensions \
+            | tr ',' '\n' \
+            | sort -u \
+            | awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
+    )"; \
+    apk add --virtual .nextcloud-phpext-rundeps $runDeps; \
+    apk del .build-deps
+
+RUN mkdir -p \
+    /usr/share/man/man1 \
+    /var/log/supervisord \
+    /var/run/supervisord \
+;
+
+COPY supervisord.conf /etc/supervisor/supervisord.conf
+
+ENV NEXTCLOUD_UPDATE=1
+
+CMD ["/usr/bin/supervisord"]