Update CI

Signed-off-by: FedericoBruzzone <federico.bruzzone.i@gmail.com>

Author: FedericoBruzzone

.github/workflows/ubuntu-x86.yml

@@ -24,18 +24,12 @@ jobs:
           CC: ${{ matrix.compiler.CC }}
           CXX: ${{ matrix.compiler.CXX }}
         run: |
-          wget -qO- https://apt.llvm.org/llvm-snapshot.gpg.key | sudo gpg --dearmor -o /usr/share/keyrings/llvm-keyring.gpg
-
-          echo "deb [signed-by=/usr/share/keyrings/llvm-keyring.gpg] http://apt.llvm.org/jammy/ llvm-toolchain-jammy-21 main" | sudo tee /etc/apt/sources.list.d/llvm.list
-
+          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+          sudo apt-add-repository "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-21 main"
+          sudo apt-get clean
           sudo apt-get update
-          sudo apt-get install -y --fix-missing \
-            llvm-21 \
-            llvm-21-dev \
-            llvm-21-tools \
-            clang-21 \
-            python3-setuptools
-
+          sudo apt-get install -y llvm-21 llvm-21-dev llvm-21-tools clang-21
+          sudo apt-get install python3-setuptools
           sudo pip3 install lit
       - name: Build `llvm-pass-template`
         run: |