[docker] Fix docker build error fall through (#7021)

docker/Dockerfile

@@ -39,8 +39,10 @@ RUN \
         python3-cffi=1.15.1-5 \
         libcairo2=1.16.0-7 \
         libmagic1=1:5.44-3 \
-        patch=2.7.6-7; \
-    if [ "$TARGETARCH$TARGETVARIANT" = "armv7" ]; then \
+        patch=2.7.6-7 \
+    && ( \
+        ( \
+            [ "$TARGETARCH$TARGETVARIANT" = "armv7" ] && \
                 apt-get install -y --no-install-recommends \
                 build-essential=12.9 \
                 python3-dev=3.11.2-1+b1 \
@@ -53,9 +55,11 @@ RUN \
                 libtiff6=4.5.0-6+deb12u1 \
                 cargo=0.66.0+ds1-1 \
                 pkg-config=1.8.1-1 \
-          gcc-arm-linux-gnueabihf=4:12.2.0-3; \
-    fi; \
-    rm -rf \
+                gcc-arm-linux-gnueabihf=4:12.2.0-3 \
+        ) \
+        || [ "$TARGETARCH$TARGETVARIANT" != "armv7" ] \
+    ) \
+    && rm -rf \
         /tmp/* \
         /var/{cache,log}/* \
         /var/lib/apt/lists/*