Adding tests

Signed-off-by: dubo-dubon-duponey <dubodubonduponey+github@pm.me>

examples/tests/README.md

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+# Testing
+
+## TL;DR
+
+```
+# Get help
+./test.sh --help
+
+# Run all tests
+# You can also just call ./test.sh with no argument
+# Also, `make integration` does exactly that
+./test.sh all
+
+# Run one random dagger cue directory, with expectations on exit code, stdout, stderr
+./test.sh fetch-git/nonexistent/ref --exit=1 --stdout=
+```
+
+By default, the dagger binary is expected to be found in ../../cmd/dagger/dagger relative to the test.sh script.
+
+If you need to change this, pass along `DAGGER_BINARY=somewhere/dagger`