pin sv2-apps images to v0.7.0

pin sv2-apps images to v0.6.0

pin sv2-apps images to v0.5.0

pin sv2-apps images to v0.5.0

pin release image tags for v0.2.1

pin sv2-apps images to v0.4.0

update Docker image versions on README.md and source files to version…

… v0.3.5

update Docker image versions on README.md and source files to version…

… v0.3.4

update Docker image versions on README.md and source files to version…

… v0.3.3

update Docker image versions on README.md and source files to version…

… v0.3.2