chore: add build_and_test.yml (#3)

Fixes #1.

Needs #2.

Any remarks and suggestions are welcome! The workflow can be triggered
manually and will be triggered on every push to main.

.github/workflows/build_and_test.yml

@@ -0,0 +1,36 @@
+---
+name: ubuntu_build
+
+'on':
+  pull_request:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+env:
+  build_path: ${{github.workspace}}/build
+
+jobs:
+  build_and_test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Create Build Environment
+        run: cmake -E make_directory ${{env.build_path}}
+
+      - name: Configure CMake
+        working-directory: ${{env.build_path}}
+        run: cmake ../
+
+      - name: Build
+        working-directory: ${{env.build_path}}
+        run: cmake --build .
+
+      - name: Test
+        working-directory: ${{env.build_path}}
+        run: ctest
+...

README.md

@@ -1,2 +1,82 @@
 # hello-ctest
 
+## Running build and test locally
+
+In order to build and test this project locally, you need to follow 4 steps:
+
+1. **Create the _Build environment_**
+
+    Create a directory for all of the _generated_ files (e.g. make files, object files, executables etc.) will be located.
+    This can be done by running the command like:
+    ```shell
+    cmake -E make_directory my_build_directory
+    ```
+    or something system specific like:
+    ```shell
+    mkdir -p my_build_directory
+    ```
+
+2. **Configure CMake**
+
+    This step _generates_ all of the files needed for the build.
+    Navigate to `my_build_directory` and run:
+    ```shell
+    cmake ../
+    ```
+    Expected output:
+    ```
+    -- The CXX compiler identification is GNU 13.2.0
+    -- Detecting CXX compiler ABI info
+    -- Detecting CXX compiler ABI info - done
+    -- Check for working CXX compiler: /usr/bin/c++ - skipped
+    -- Detecting CXX compile features
+    -- Detecting CXX compile features - done
+    -- Using CTEST_RESOURCE_SPEC_FILE = some_path/hello-ctest/test-resource-spec.json
+    -- CMAKE_INSTALL_PREFIX = some_path/hello-ctest/my_build_directory/install/hello-ctest -- Use the cmake --install-prefix arg to override.
+    -- Configuring done (0.2s)
+    -- Generating done (0.0s)
+    -- Build files have been written to: some_path/hello-ctest/my_build_directory
+    ```
+
+3. **Build the project**
+
+    Navigate to `my_build_directory` and run:
+    ```shell
+    cmake --build .
+    ```
+    The output should look like:
+    ```
+    [ 50%] Building CXX object src/CMakeFiles/hello-ctest.dir/main.cpp.o
+    [100%] Linking CXX executable hello-ctest
+    [100%] Built target hello-ctest
+    ```
+
+4. **Execute the tests using `ctest`**
+
+    Tests in this project are expresed using [`ctest`](https://cmake.org/cmake/help/latest/manual/ctest.1.html).
+    To execute all of them navigate to `my_build_directory` and run:
+    ```
+    ctest
+    ```
+    The output should look like:
+    ```
+    Test project some_path/hello-ctest/my_build_directory
+        Start 1: run_hello-ctest
+    1/6 Test #1: run_hello-ctest ..................   Passed    0.00 sec
+        Start 2: Hello_One
+    2/6 Test #2: Hello_One ........................   Passed    0.00 sec
+        Start 3: Hello_Two
+    3/6 Test #3: Hello_Two ........................   Passed    0.00 sec
+        Start 4: Hello_Three
+    4/6 Test #4: Hello_Three ......................   Passed    0.00 sec
+        Start 5: Hello_Four
+    5/6 Test #5: Hello_Four .......................   Passed    0.00 sec
+        Start 6: Hello_Five
+    6/6 Test #6: Hello_Five .......................   Passed    0.00 sec
+
+    100% tests passed, 0 tests failed out of 6
+
+    Total Test time (real) =   0.02 sec
+    ```
+
+These steps are reflected in [`build_and_test.yml`](.github/workflows/build_and_test.yml) workflow.