Add workflow to upload coverage and test reports

.github/workflows/publish-test-results.yml

@@ -0,0 +1,73 @@
+name: Publish test and coverage results
+
+on:
+  workflow_run:
+    workflows: ["Lint and test"]
+    types:
+      - completed
+
+jobs:
+  publish-test-results:
+    name: "Publish test and coverage results"
+    runs-on: ubuntu-latest
+    if: github.event.workflow_run.conclusion != 'skipped' && github.repository_owner == 'Uninett'
+
+    steps:
+      # Checking out the repo is necessary codecov/codecov-action@v5 to work properly
+      # Codecov requires source code to process the coverage file and generate coverage
+      # reports
+      - name: Checkout Code
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.workflow_run.head_sha }}
+
+      - name: Download and Extract Artifacts
+        env:
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+        run: |
+           mkdir -p artifacts && cd artifacts
+
+           artifacts_url=${{ github.event.workflow_run.artifacts_url }}
+
+           gh api "$artifacts_url" -q '.artifacts[] | [.name, .archive_download_url] | @tsv' | while read artifact
+           do
+             IFS=$'\t' read name url <<< "$artifact"
+             gh api $url > "$name.zip"
+             unzip -o -d "$name" "$name.zip"
+           done
+
+      - name: "Publish test results"
+        uses: EnricoMi/publish-unit-test-result-action@v2
+        with:
+          commit: ${{ github.event.workflow_run.head_sha }}
+          check_name: "Test results"
+          files: artifacts/**/*-results.xml
+
+      - name: Read PR number file
+        if: ${{ hashFiles('artifacts/extra/pr_number') != '' }}
+        run: |
+          pr_number=$(cat artifacts/extra/pr_number)
+          re='^[0-9]+$'
+          if [[ $pr_number =~ $re ]] ; then
+            echo "PR_NUMBER=$pr_number" >> $GITHUB_ENV
+          fi
+
+      - name: Read base SHA file
+        if: ${{ hashFiles('artifacts/extra/base_sha') != '' }}
+        run: |
+          base_sha=$(cat artifacts/extra/base_sha)
+          re='[0-9a-f]{40}'
+          if [[ $base_sha =~ $re ]] ; then
+            echo "BASE_SHA=$base_sha" >> $GITHUB_ENV
+          fi
+
+      - name: Upload to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          fail_ci_if_error: true
+          token: ${{ secrets.CODECOV_TOKEN }}
+          verbose: true
+          override_branch: ${{ github.event.workflow_run.head_branch}}
+          override_commit: ${{ github.event.workflow_run.head_sha}}
+          commit_parent: ${{ env.BASE_SHA }}
+          override_pr: ${{ env.PR_NUMBER }}