github actions: add standalone ecl builds and testing

.github/workflows/ekf_functional_change_indicator.yml

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+name: EKF Change Indicator
+
+on: pull_request
+
+jobs:
+  unit_tests:
+    runs-on: ubuntu-latest
+    container: px4io/px4-dev-base-focal:2021-05-04
+    steps:
+    - uses: actions/checkout@v2.3.1
+    - name: checkout newest version of branch
+      run: |
+        git fetch origin pull/${{github.event.pull_request.number}}/head:${{github.head_ref}}
+        git checkout ${GITHUB_HEAD_REF}
+    - name: main test
+      run: cd ${GITHUB_WORKSPACE}/src/lib/ecl; make test
+      working-directory: src/lib/ecl
+    - name: Check if there is a functional change
+      run: git diff --exit-code
+      working-directory: src/lib/ecl/test/change_indication

.github/workflows/ekf_standalone_build_tests.yml

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+
+name: EKF Build Tests
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - '*'
+
+jobs:
+  Linux-GCC:
+    runs-on: ubuntu-latest
+    container: px4io/px4-dev-base-focal:2021-05-04
+    steps:
+    - uses: actions/checkout@v1
+    - name: main build
+      run: make
+      working-directory: src/lib/ecl
+    - name: clean build
+      run: make clean
+      working-directory: src/lib/ecl
+    - name: main test
+      run: make test
+      working-directory: src/lib/ecl
+  Linux-Clang:
+    runs-on: ubuntu-latest
+    container: px4io/px4-dev-clang:2021-05-04
+    env:
+      CC: clang
+      CXX: clang++
+    steps:
+      - uses: actions/checkout@v1
+      - name: main build
+        run: make
+        working-directory: src/lib/ecl
+      - name: clean build
+        run: make clean
+        working-directory: src/lib/ecl
+      - name: main test
+        run: make test
+        working-directory: src/lib/ecl
+  Mac-OS:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: main build
+        run: make
+        working-directory: src/lib/ecl
+      - name: clean build
+        run: make clean
+        working-directory: src/lib/ecl
+      - name: main test
+        run: make test
+        working-directory: src/lib/ecl

.github/workflows/ekf_update_change_indicator.yml

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+name: EKF Update Change Indicator
+
+on: push
+
+jobs:
+  unit_tests:
+    runs-on: ubuntu-latest
+    container: px4io/px4-dev-base-focal:2021-05-04
+    env:
+      GIT_COMMITTER_EMAIL: bot@px4.io
+      GIT_COMMITTER_NAME: PX4BuildBot
+    steps:
+    - uses: actions/checkout@v2.3.1
+    - name: main test updates change indication files
+      run: cd ${GITHUB_WORKSPACE}/src/lib/ecl; make test
+    - name: Check if there exists diff and save result in variable
+      run: echo "CHANGE_INDICATED=$(git diff --exit-code --output=/dev/null || echo $?)" >> $GITHUB_ENV
+      working-directory: src/lib/ecl/test/change_indication
+    - name: auto-commit any changes to change indication
+      uses: stefanzweifel/git-auto-commit-action@v4
+      with:
+        commit_message: '[AUTO COMMIT] update change indication'
+        commit_user_name: ${GIT_COMMITTER_NAME}
+        commit_user_email: ${GIT_COMMITTER_EMAIL}
+    - if: ${{env.CHANGE_INDICATED}}
+      name: if there is a functional change, fail check
+      run: exit 1