Add apt update to fix build

.github/workflows/build.yml

@@ -26,6 +26,7 @@ jobs:
 
       - name: Install xdelta and ARM GCC
         run: |
+            sudo apt update
             sudo apt-get install xdelta3 gcc-arm-none-eabi binutils-arm-none-eabi libpng-dev
 
       - name: Install agbcc
@@ -33,7 +34,7 @@ jobs:
           ./build.sh
           ./install.sh ../
         working-directory: agbcc
-      
+
       - name: Build tools and baserom
         run: |
           cd $GITHUB_WORKSPACE
@@ -41,15 +42,15 @@ jobs:
           head -c 33554432 /dev/zero > tmp.bin
           xdelta3 -d -s tmp.bin baserom.xdelta baserom.gba
           rm tmp.bin
-        
+
       - name: Build via Makefile
         run: |
           make -j${nproc} compare
-          
+
       - name: Modern
         run: |
           make -j${nproc} modern
-      
+
       # only run OK when pushed to master
       - name: Run OK webhook
         shell: bash