compile fails test, require qt5.15 c++17

If some steps of compile.sh doesn't return 0, the whole compile.sh will
return 1, so github actions can actually notify if build fails

.github/workflows/package.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       matrix:
         qt_version: [5.15.0]
-        platform: [ubuntu-20.04]
+        platform: [ubuntu-latest]
         arch: [x64]
       fail-fast: false
     runs-on: ${{ matrix.platform }}

README.md

@@ -33,7 +33,7 @@ To run only ``qt5-base`` (Archlinux) or ``qt5-default`` (Debian) is required.
 
 ### Compile
 
-To compile, Qt version must be at least 5.14.
+To compile, Qt version must be at least 5.15.
 
 ```bash
 mkdir wayPreview1

scripts/compile.sh

@@ -5,14 +5,14 @@ PW="${PWD}"
 
 mkdir ../../clientBuild/
 cd ../../clientBuild
-qmake ../wayPreview/wayPreviewClient/wayPreviewClient.pro
-make -j$NPROC
+qmake ../wayPreview/wayPreviewClient/wayPreviewClient.pro || exit 1
+make -j$NPROC || exit 1
 
 cd "${PW}"
 
 mkdir ../../serverBuild/
 cd ../../serverBuild
-qmake ../wayPreview/wayPreviewServer/wayPreviewServer.pro
-make -j$NPROC
+qmake ../wayPreview/wayPreviewServer/wayPreviewServer.pro || exit 1
+make -j$NPROC || exit 1
 
 cd "${PW}"

wayPreviewClient/wayPreviewClient.pro

@@ -1,4 +1,4 @@
 QT += widgets network
-CONFIG += c++17
+CONFIG += c++1z
 
 SOURCES       = main.cpp

wayPreviewServer/wayPreviewServer.pro

@@ -1,5 +1,5 @@
 QT += widgets network
-CONFIG += c++17
+CONFIG += c++1z
 
 HEADERS       = wayPreviewServer.h
 SOURCES       = wayPreviewServer.cpp \