[Azp]: Add dash-api dependencies on building Azp ubuntu20.04 (#17507)

Signed-off-by: Ze Gan <ganze718@gmail.com>

.azure-pipelines/azure-pipelines-build-ubuntu-2004.yml

@@ -38,7 +38,8 @@ stages:
                          cmake pkg-config python3-pip python cmake libgtest-dev libgmock-dev libyang-dev \
                          debhelper-compat dh-elpa dh-sequence-python3 python3-all \
                          libpython3-all-dev python3-six xmlto unzip rake-compiler gem2deb pkg-php-tools \
-                         ant default-jdk maven-repo-helper libguava-java
+                         ant default-jdk maven-repo-helper libguava-java \
+                         libboost-all-dev libgtest-dev build-essential
         wget http://ftp.us.debian.org/debian/pool/main/libg/libgoogle-gson-java/libgoogle-gson-java_2.8.6-1+deb11u1_all.deb
         sudo dpkg -i libgoogle-gson-java_2.8.6-1+deb11u1_all.deb
         mkdir -p /tmp/artifacts