fix: install composer from composer image

docker/wordpress/Dockerfile

@@ -15,12 +15,13 @@ RUN curl -O https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli
     mv wp-cli.phar /usr/local/bin/wp
 
 # install composer dependencies
+COPY --from=composer:latest /usr/bin/composer /usr/bin/composer
 COPY composer.json composer.lock ./
-RUN --mount=type=secret,id=GITEA_TOKEN \
-    test -n "${GITEA_TOKEN}" && \
-    export TOKEN=$(cat /run/secrets/GITEA_TOKEN) && \
-    composer config --global auth.http-basic.seu-gitea.com token $TOKEN && \
-    composer install --no-dev --optimize-autoloader
+RUN composer install \
+    --no-dev \
+    --no-interaction \
+    --optimize-autoloader \
+    --no-scripts
 
 # modify docker entrypoint for running any .sh scripts found under /usr/local/bin/docker-entrypoint.d
 # scripts will run as www-data if endedd with .unpriv.sh or as root elsewhere
@@ -44,3 +45,6 @@ EOF
 COPY docker/wordpress/scripts/docker-entrypoint.d/* /docker-entrypoint.d/
 
 RUN chmod +x /docker-entrypoint.d/*.sh
+
+# cleanup
+RUN rm /usr/bin/composer