CI: Properly exclude Azure repositories on Ubuntu

Nuke all the pre-defined repos, we just need stock Ubuntu.

.github/workflows/android_builds.yml

@@ -18,6 +18,7 @@ jobs:
       # Azure repositories are not reliable, we need to prevent azure giving us packages.
       - name: Make apt sources.list use the default Ubuntu repositories
         run: |
+          sudo rm -f /etc/apt/sources.list.d/*
           sudo cp -f misc/ci/sources.list /etc/apt/sources.list
           sudo apt-get update
 

.github/workflows/javascript_builds.yml

@@ -19,6 +19,7 @@ jobs:
       # Azure repositories are not reliable, we need to prevent azure giving us packages.
       - name: Make apt sources.list use the default Ubuntu repositories
         run: |
+          sudo rm -f /etc/apt/sources.list.d/*
           sudo cp -f misc/ci/sources.list /etc/apt/sources.list
           sudo apt-get update
 

.github/workflows/linux_builds.yml

@@ -17,6 +17,7 @@ jobs:
       # Azure repositories are not reliable, we need to prevent azure giving us packages.
       - name: Make apt sources.list use the default Ubuntu repositories
         run: |
+          sudo rm -f /etc/apt/sources.list.d/*
           sudo cp -f misc/ci/sources.list /etc/apt/sources.list
           sudo apt-get update
 
@@ -77,6 +78,7 @@ jobs:
       # Azure repositories are not reliable, we need to prevent azure giving us packages.
       - name: Make apt sources.list use the default Ubuntu repositories
         run: |
+          sudo rm -f /etc/apt/sources.list.d/*
           sudo cp -f misc/ci/sources.list /etc/apt/sources.list
           sudo apt-get update
 

.github/workflows/static_checks.yml

@@ -9,9 +9,15 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
 
+      # Azure repositories are not reliable, we need to prevent azure giving us packages.
+      - name: Make apt sources.list use the default Ubuntu repositories
+        run: |
+          sudo rm -f /etc/apt/sources.list.d/*
+          sudo cp -f misc/ci/sources.list /etc/apt/sources.list
+          sudo apt-get update
+
       - name: Install dependencies
         run: |
-          sudo apt-get update -qq
           sudo apt-get install -qq dos2unix recode clang-format
           sudo pip3 install git+https://github.com/psf/black@master pygments