Add script to show why cannot clone private git repo via SSH

Author: OttoHung

scripts/build-path/git/ssh/private/build_from_root.sh

@@ -0,0 +1,26 @@
+IMG_NAME=docker.tutorials:build-path-git-ssh-private
+export DOCKER_BUILDKIT=1
+
+# By using this to build docker image, a `Dockerfile` is 
+# required at root directory.
+#
+## This build will fail because the SSH key is not
+## provided. It's not recommended adding SSH key via 
+## `Dockerfile` because it can be seen in the build log 
+## as plain text.
+## The best practice is using `--ssh` to pass SSH clinet 
+## agent to docker deamon and use `git clone` in the 
+## `Dockerfile`.
+REPO=git@github.com:OttoHung/private-test.git#main
+
+echo "Start to build docker image from: ${REPO}"
+
+# Build docker image from public git repository via HTTPS
+#
+# The path of `Dockerfile` is not required because this 
+# approach gathers `Dockerfile` from repository.
+docker build \
+        --secret id=npm,src=$HOME/.npmrc \
+        --no-cache \
+        -t ${IMG_NAME} \
+        ${REPO}