Run apt-get update

Fixes

Err:1 http://azure.archive.ubuntu.com/ubuntu focal-updates/universe amd64 libnss3-tools amd64 2:3.49.1-1ubuntu1.6
  404  Not Found [IP: 40.81.13.82 80]
E: Failed to fetch http://azure.archive.ubuntu.com/ubuntu/pool/universe/n/nss/libnss3-tools_3.49.1-1ubuntu1.6_amd64.deb  404  Not Found [IP: 40.81.13.82 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

Author: macbre

.github/workflows/dockerimage.yml

@@ -19,7 +19,8 @@ jobs:
         MKCERT_VERSION: v1.4.3
       run: |
         set -x
-        sudo apt-get install -y libnss3-tools
+        sudo apt-get update && \
+          sudo apt-get install -y libnss3-tools
 
         curl https://github.com/FiloSottile/mkcert/releases/download/${MKCERT_VERSION}/mkcert-${MKCERT_VERSION}-linux-amd64 --location --output /tmp/mkcert
         chmod 744 /tmp/mkcert