I really don't understand batch scripts

Author: iluuu1994

.github/scripts/windows/build_task.bat

@@ -24,6 +24,7 @@ del /f /q C:\Windows\System32\libssl-1_1-x64.dll >NUL 2>NUL
 if %errorlevel% neq 0 exit /b 3
 
 call %~dp0find-target-branch.bat
+echo Branch: %BRANCH%
 set STABILITY=staging
 set DEPS_DIR=%PHP_BUILD_CACHE_BASE_DIR%\deps-%BRANCH%-%PHP_SDK_VS%-%PHP_SDK_ARCH%
 rem SDK is cached, deps info is cached as well

.github/scripts/windows/find-target-branch.bat

@@ -1,22 +1,8 @@
 @echo off
-SetLocal EnableDelayedExpansion
 
-if /i "%APPVEYOR%" equ "True" (
-	if /i "%APPVEYOR_REPO_BRANCH:~0,4%" equ "php-" (
-		set BRANCH=%APPVEYOR_REPO_BRANCH:~4,3%
-	) else (
-		set BRANCH=master
-	)
-) else (
-	if "%GITHUB_BASE_REF%" equ "master" (
-		set BRANCH=master
-	) else (
-		if "%GITHUB_HEAD_REF%" equ "master" (
-			set BRANCH=master
-		) else (
-			for /f "usebackq tokens=3" %%i in (`findstr PHP_MAJOR_VERSION main\php_version.h`) do set BRANCH=%%i
-			for /f "usebackq tokens=3" %%i in (`findstr PHP_MINOR_VERSION main\php_version.h`) do set BRANCH=!BRANCH!.%%i
-		)
-	)
+for /f "usebackq tokens=3" %%i in (`findstr PHP_MAJOR_VERSION main\php_version.h`) do set BRANCH=%%i
+for /f "usebackq tokens=3" %%i in (`findstr PHP_MINOR_VERSION main\php_version.h`) do set BRANCH=%BRANCH%.%%i
+
+if /i "%BRANCH%" equ "8.3" (
+	set BRANCH=master
 )
-echo !BRANCH!

.github/workflows/push.yml

@@ -22,6 +22,7 @@ env:
   CXX: ccache g++
 jobs:
   LINUX_X64:
+    if: false
     strategy:
       fail-fast: false
       matrix:
@@ -73,6 +74,7 @@ jobs:
       - name: Verify generated files are up to date
         uses: ./.github/actions/verify-generated-files
   LINUX_X32:
+    if: false
     name: LINUX_X32_DEBUG_ZTS
     runs-on: ubuntu-latest
     container:
@@ -119,6 +121,7 @@ jobs:
             -d opcache.enable_cli=1
             -d opcache.jit_buffer_size=16M
   MACOS_DEBUG_NTS:
+    if: false
     runs-on: macos-11
     steps:
       - name: git checkout
@@ -178,17 +181,17 @@ jobs:
         run: git config --global core.autocrlf false && git config --global core.eol lf
       - name: git checkout
         uses: actions/checkout@v2
-      - name: Setup MySQL
-        run: |
-          choco install mysql -y --no-progress --params="/port:3306"
-          mysql.exe --port=3306 --user=root --password="" -e "ALTER USER 'root'@'localhost' IDENTIFIED BY 'Password12!'; FLUSH PRIVILEGES;"
-      - name: Setup MSSQL
-        run: |
-          choco install sql-server-express -y --no-progress --install-arguments="/SECURITYMODE=SQL /SAPWD=Password12!"
-      - name: Setup PostgreSQL
-        run: |
-          Set-Service -Name "postgresql-x64-14" -StartupType manual -Status Running
-          pwsh -Command { $env:PGPASSWORD="root"; & "$env:PGBIN\psql" -U postgres -c "ALTER USER postgres WITH PASSWORD 'Password12!';" }
+      # - name: Setup MySQL
+      #   run: |
+      #     choco install mysql -y --no-progress --params="/port:3306"
+      #     mysql.exe --port=3306 --user=root --password="" -e "ALTER USER 'root'@'localhost' IDENTIFIED BY 'Password12!'; FLUSH PRIVILEGES;"
+      # - name: Setup MSSQL
+      #   run: |
+      #     choco install sql-server-express -y --no-progress --install-arguments="/SECURITYMODE=SQL /SAPWD=Password12!"
+      # - name: Setup PostgreSQL
+      #   run: |
+      #     Set-Service -Name "postgresql-x64-14" -StartupType manual -Status Running
+      #     pwsh -Command { $env:PGPASSWORD="root"; & "$env:PGBIN\psql" -U postgres -c "ALTER USER postgres WITH PASSWORD 'Password12!';" }
       - name: Build
         run: .github/scripts/windows/build.bat
       - name: Test