Compile libmpdec-dev from sources

The package is not available on Debian Bookworm.

dockerfile.sh

@@ -14,8 +14,26 @@ if [[ -n "$COVERAGE_FILE" ]]; then
 fi
 
 if [[ -z "$EXT_DISABLE_DECIMAL" || "0" == "$EXT_DISABLE_DECIMAL" || "false" == "$EXT_DISABLE_DECIMAL" ]] ; then
-  RUN_CMDS="$RUN_CMDS && \\\\\n    apt-get install -y libmpdec-dev"
-  RUN_CMDS="$RUN_CMDS && \\\\\n    pecl install decimal && docker-php-ext-enable decimal"
+    # PHP 8.x images are based on Debian Bookworm, where the libmpdec-dev package
+    # is not available, therefore the package has to be compiled from sources.
+    # See https://github.com/docker-library/php/pull/1416.
+
+    MPDEC_RELEASE_NAME="mpdecimal-2.5.1"
+    MPDEC_URL="https://www.bytereef.org/software/mpdecimal/releases/$MPDEC_RELEASE_NAME.tar.gz"
+    MPDEC_SHA256_SUM="9f9cd4c041f99b5c49ffb7b59d9f12d95b683d88585608aa56a6307667b2b21f"
+    MPDEC_TMP_DIR="/tmp/$MPDEC_RELEASE_NAME"
+    MPDEC_TMP_ARCHIVE="$MPDEC_TMP_DIR/$MPDEC_RELEASE_NAME.tar.gz"
+
+    RUN_CMDS="$RUN_CMDS\\n\\nRUN"
+    RUN_CMDS="$RUN_CMDS mkdir -p $MPDEC_TMP_DIR"
+    RUN_CMDS="$RUN_CMDS && \\\\\n    cd $MPDEC_TMP_DIR"
+    RUN_CMDS="$RUN_CMDS && \\\\\n    curl -LO $MPDEC_URL"
+    RUN_CMDS="$RUN_CMDS && \\\\\n    echo \"$MPDEC_SHA256_SUM $MPDEC_TMP_ARCHIVE\" | sha256sum --check --status -"
+    RUN_CMDS="$RUN_CMDS && \\\\\n    tar xf $MPDEC_TMP_ARCHIVE"
+    RUN_CMDS="$RUN_CMDS && \\\\\n    cd $MPDEC_RELEASE_NAME"
+    RUN_CMDS="$RUN_CMDS && \\\\\n    ./configure && make && make install"
+    RUN_CMDS="$RUN_CMDS && \\\\\n    rm -rf $MPDEC_TMP_DIR"
+    RUN_CMDS="$RUN_CMDS && \\\\\n    pecl install decimal && docker-php-ext-enable decimal"
 fi
 
 echo -e "