fix: make libmagickcore-extra conditional for multi-arch Docker builds

arm64 uses Debian bookworm (libmagickcore-6.q16-6-extra) while amd64
uses Ubuntu 24.04 (libmagickcore-6.q16-7-extra). Probing both variants
prevents build failures on the arm64 platform.

docker/Dockerfile

@@ -148,7 +148,6 @@ RUN for i in 1 2 3; do apt-get -o Acquire::Retries=3 update && break || sleep $(
     apt-get install -y --no-install-recommends \
     tini \
     imagemagick \
-    libmagickcore-6.q16-7-extra \
     libraw-dev \
     libopenexr-dev \
     potrace \
@@ -163,6 +162,11 @@ RUN for i in 1 2 3; do apt-get -o Acquire::Retries=3 update && break || sleep $(
     libgl1 libglib2.0-0 \
     libegl1 libwayland-egl1 libwayland-client0 libwayland-cursor0 \
     libxkbcommon-x11-0 libxkbcommon0 libxcursor1 \
+    && if apt-cache show libmagickcore-6.q16-7-extra >/dev/null 2>&1; then \
+         apt-get install -y --no-install-recommends libmagickcore-6.q16-7-extra; \
+       elif apt-cache show libmagickcore-6.q16-6-extra >/dev/null 2>&1; then \
+         apt-get install -y --no-install-recommends libmagickcore-6.q16-6-extra; \
+       fi \
     && if apt-cache show libheif-plugin-x265 >/dev/null 2>&1; then \
          apt-get install -y --no-install-recommends libheif-plugin-x265; \
        fi \

package.json

@@ -1,6 +1,6 @@
 {
   "name": "snapotter",
-  "version": "1.15.9",
+  "version": "1.15.10",
   "private": true,
   "packageManager": "pnpm@9.15.4",
   "scripts": {