add u-boot course

Author: xcorail

courses/cpp/uboot/README.md

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+# CodeQL LearningLab Course Action Template
+
+Copy this entire directory,
+and replace the following:
+
+* Replace `<owner>`, `<repo>` and `<pkg>` in the `image` property in
+  [`action.yml`](action.yml) to reference the correct repository
+  where the docker image will be published,
+  and with a package name of your choice.
+  (For courses in this repository,
+  we use the convention of taking the course path,
+  and replacing slashes with dashes,
+  e.g. `courses/cpp/ctf-segv` becomes `courses-cpp-ctf-segv`)
+* Replace the zip file URL in [`image/Dockerfile`](image/Dockerfile)
+  to point to the CodeQL database that will be used in your course.
+
+After this,
+update [`answers/`](answers) and [`image/config/`](image/config)
+to add your model answers and expected query results as appropriate.

courses/cpp/uboot/action.yml

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+name: 'Check queries'
+description: 'Check that the queries that have been pushed produce the correct results'
+author: 'GitHub <[email protected]>'
+runs:
+  using: 'docker'
+  image: 'docker://docker.pkg.github.com/github/codeql-learninglab-actions/courses-cpp-uboot'
+branding:
+  icon: 'check-circle'
+  color: 'purple'

courses/cpp/uboot/answers/qlpack.yml

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+name: codeql-uboot
+version: 0.0.0
+libraryPathDependencies: codeql-cpp # Update this with appropriate language

courses/cpp/uboot/answers/step-01.ql

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+import cpp
+
+from Function f
+where f.getName() = "getchar"
+select f

courses/cpp/uboot/answers/step-02.ql

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+import cpp
+
+from Function f
+where f.getName() = "getchar"
+select f

courses/cpp/uboot/image/Dockerfile

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+FROM docker.pkg.github.com/github/codeql-learninglab-actions/codeql-learninglab-check:v0.0.8
+
+## Add course config
+COPY --chown=codeql:codeql config /home/codeql/config
+WORKDIR /home/codeql/config
+# Download, unzip and then delete the zip file in one step to reduce image size
+RUN wget --quiet https://downloads.lgtm.com/snapshots/cpp/uboot/u-boot_u-boot_cpp-srcVersion_d0d07ba86afc8074d79e436b1ba4478fa0f0c1b5-dist_odasa-2019-07-25-linux64.zip -O database.zip && unzip -qq database.zip && rm -rf database.zip

courses/cpp/uboot/image/config/config.json

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+{
+  "databasePath": "u-boot_u-boot_d0d07ba",
+  "locationPaths": "https://github.com/u-boot/u-boot/blob/d0d07ba86afc8074d79e436b1ba4478fa0f0c1b5{path}#L{line-start}-L{line-end}",
+  "expectedResults": {
+    "step-01.ql": false
+  }
+}

courses/cpp/uboot/image/config/step-01.csv

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+"f","URL for f","col1"
+"getchar","file:///opt/src/libio/getchar.c:33:1:33:7","a getchar function"
+"getchar","file:///opt/src/libio/bits/stdio.h:47:1:47:7","a getchar function"
+"getchar","file:///opt/src/libio/bits/stdio.h:47:1:47:7","a getchar function"