Apply changes from #2033 to the examples. (#2046)

Signed-off-by: David Li <david@davidl.me>

.examples/dockerfiles/full/apache/Dockerfile

@@ -38,9 +38,9 @@ RUN set -ex; \
     apt-mark auto '.*' > /dev/null; \
     apt-mark manual $savedAptMark; \
     ldd "$(php -r 'echo ini_get("extension_dir");')"/*.so \
-        | awk '/=>/ { print $3 }' \
+        | awk '/=>/ { so = $(NF-1); if (index(so, "/usr/local/") == 1) { next }; gsub("^/(usr/)?", "", so); print so }' \
         | sort -u \
-        | xargs -r dpkg-query -S \
+        | xargs -r dpkg-query --search \
         | cut -d: -f1 \
         | sort -u \
         | xargs -rt apt-mark manual; \

.examples/dockerfiles/full/fpm/Dockerfile

@@ -38,9 +38,9 @@ RUN set -ex; \
     apt-mark auto '.*' > /dev/null; \
     apt-mark manual $savedAptMark; \
     ldd "$(php -r 'echo ini_get("extension_dir");')"/*.so \
-        | awk '/=>/ { print $3 }' \
+        | awk '/=>/ { so = $(NF-1); if (index(so, "/usr/local/") == 1) { next }; gsub("^/(usr/)?", "", so); print so }' \
         | sort -u \
-        | xargs -r dpkg-query -S \
+        | xargs -r dpkg-query --search \
         | cut -d: -f1 \
         | sort -u \
         | xargs -rt apt-mark manual; \

.examples/dockerfiles/imap/apache/Dockerfile

@@ -17,9 +17,9 @@ RUN set -ex; \
     apt-mark auto '.*' > /dev/null; \
     apt-mark manual $savedAptMark; \
     ldd "$(php -r 'echo ini_get("extension_dir");')"/*.so \
-        | awk '/=>/ { print $3 }' \
+        | awk '/=>/ { so = $(NF-1); if (index(so, "/usr/local/") == 1) { next }; gsub("^/(usr/)?", "", so); print so }' \
         | sort -u \
-        | xargs -r dpkg-query -S \
+        | xargs -r dpkg-query --search \
         | cut -d: -f1 \
         | sort -u \
         | xargs -rt apt-mark manual; \

.examples/dockerfiles/imap/fpm/Dockerfile

@@ -17,9 +17,9 @@ RUN set -ex; \
     apt-mark auto '.*' > /dev/null; \
     apt-mark manual $savedAptMark; \
     ldd "$(php -r 'echo ini_get("extension_dir");')"/*.so \
-        | awk '/=>/ { print $3 }' \
+        | awk '/=>/ { so = $(NF-1); if (index(so, "/usr/local/") == 1) { next }; gsub("^/(usr/)?", "", so); print so }' \
         | sort -u \
-        | xargs -r dpkg-query -S \
+        | xargs -r dpkg-query --search \
         | cut -d: -f1 \
         | sort -u \
         | xargs -rt apt-mark manual; \