Initial import of actions and functions for GHA

Signed-off-by: Brian J. Murrell <brian.murrell@intel.com>

.github/CODEOWNERS

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+# Have Actions Watchers added as a reviewer to any GitHub Actions
+* @daos-stack/actions-watchers

.github/workflows/bash_unit.yml

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+name: bash_unit Tests
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  bash-unit-testing:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+    - name: Unit testing with bash_unit
+      run: |
+        curl -s https://raw.githubusercontent.com/pgrange/bash_unit/master/install.sh | bash
+        FORCE_COLOR=true ./bash_unit tests/test_*

.github/workflows/linting.yml

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+name: Linting
+
+# Always run on Pull Requests as then these checks can be marked as required.
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+permissions: {}
+
+jobs:
+  shell-check:
+    name: ShellCheck
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+      - name: Add error parser
+        run: echo -n "::add-matcher::shellcheck-matcher.json"
+      - name: Run ShellCheck
+        uses: ludeeus/action-shellcheck@2.0.0
+        with:
+          format: gcc
+
+  linting-summary:
+    name: Linting Summary
+    runs-on: ubuntu-22.04
+    needs: [shell-check]
+    if: (!cancelled())
+    steps:
+      - name: Check if any job failed
+        run: |
+          if [[ -z "$(echo "${{ join(needs.*.result, '') }}" | sed -e 's/success//g')" ]]; then
+            echo "All jobs succeeded"
+          else
+            echo "One or more jobs did not succeed"
+            exit 1
+          fi