fix(desktop): supersede the legacy linux packages on upgrade (#2842)

fluxer_desktop/packaging/linux/rpm-after-remove.tpl

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+if [ ! -e '/opt/${sanitizedProductName}/${executable}' ]; then
+    if type update-alternatives >/dev/null 2>&1; then
+        update-alternatives --remove '${executable}' '/opt/${sanitizedProductName}/${executable}'
+    else
+        rm -f '/usr/bin/${executable}'
+    fi
+fi
+
+if [ "$1" = 0 ]; then
+    APPARMOR_PROFILE_DEST='/etc/apparmor.d/${executable}'
+    if [ -f "$APPARMOR_PROFILE_DEST" ]; then
+        if apparmor_status --enabled > /dev/null 2>&1; then
+            if ! { [ -x '/usr/bin/ischroot' ] && /usr/bin/ischroot; } && hash apparmor_parser 2>/dev/null; then
+                apparmor_parser --remove "$APPARMOR_PROFILE_DEST" || true
+            fi
+        fi
+        rm -f "$APPARMOR_PROFILE_DEST"
+    fi
+fi

fluxer_desktop/packaging/linux/rpm-post-transaction.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+LEGACY_DIR='/opt/Fluxer Canary'
+if [ -d "$LEGACY_DIR" ]; then
+    if [ -z "$(find "$LEGACY_DIR" ! -type d -print -quit 2>/dev/null)" ]; then
+        find "$LEGACY_DIR" -depth -type d -exec rmdir {} + >/dev/null 2>&1 || true
+    fi
+fi
+
+exit 0