Add testing and packaging files

.github/dependabot.yml

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+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions" # See documentation for possible values
+    directory: "/" # Workflow files stored in the default location of `.github/workflows`
+    schedule:
+      interval: "weekly"

.github/workflows/package.yml

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+name: conda packaging and deployment
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [qa, main]
+    tags: ['v*']
+
+jobs:
+  linux:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash -l {0}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: conda-incubator/setup-miniconda@v3
+        with:
+          auto-update-conda: true
+          channels: conda-forge,defaults
+          use-mamba: true
+          environment-file: environment.yml
+      - name: install additional dependencies
+        run: |
+          echo "installing additional dependencies from environment_development.yml"
+      - name: build conda package
+        run: |
+          # set up environment
+          cd conda.recipe
+          echo "versioningit $(versioningit ../)"
+          # build the package
+          VERSION=$(versioningit ../) conda mambabuild --channel conda-forge --output-folder . .
+          conda verify noarch/drtsans*.tar.bz2
+      - name: upload conda package to anaconda
+        shell: bash -l {0}
+        if: startsWith(github.ref, 'refs/tags/v')
+        env:
+          ANACONDA_API_TOKEN: ${{ secrets.ANACONDA_TOKEN }}
+          IS_RC: ${{ contains(github.ref, 'rc') }}
+        run: |
+          # label is main or rc depending on the tag-name
+          CONDA_LABEL="main"
+          if [ "${IS_RC}" = "true" ]; then CONDA_LABEL="rc"; fi
+          echo pushing ${{ github.ref }} with label $CONDA_LABEL
+          anaconda upload --label $CONDA_LABEL conda.recipe/noarch/drtsans*.tar.bz2

.github/workflows/test.yml

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+name: test
+
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches: [next, qa, main]
+    tags: ['v*']
+
+jobs:
+  linux:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash -l {0}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: conda-incubator/setup-miniconda@v3
+        with:
+          auto-update-conda: true
+          channels: conda-forge,defaults
+          use-mamba: true
+          environment-file: environment.yml
+          lfs: true
+          submodules: recursive
+      - name: install additional dependencies
+        run: |
+          echo "installing additional dependencies if cannot be installed from conda"
+      - name: test preparation
+        run: |
+          python -m pip install -e .
+          versioningit -vw
+          git lfs pull
+          git submodule update --init --recursive
+      - name: run unit tests
+        run: |
+          echo "running unit tests"
+          python -m pytest -m "not mount_eqsans" -vv --dist loadscope -n 2 --cov=src --cov-report=xml:unit_test_coverage.xml --cov-report=term --junitxml=unit_test_results.xml tests/unit/
+      - name: run integration tests
+        run: |
+          echo "running integration tests"
+          python -m pytest -m "not mount_eqsans" -vv --dist loadscope -n 2 --cov=src --cov-report=xml:integration_test_coverage.xml --cov-report=term --junitxml=integration_test_results.xml tests/integration/
+      - name: upload coverage to codecov
+        uses: codecov/codecov-action@v5
+        if:
+          github.actor != 'dependabot[bot]'
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: |
+            unit_test_coverage.xml
+            integration_test_coverage.xml
+      - name: build conda package
+        run: |
+          # test that the conda package builds
+          cd conda.recipe
+          echo "versioningit $(versioningit ../)"
+          # conda channels could have been defined in the conda-incubator, but you can copy/paste the lines
+          # below to build the conda package in your local machine
+          CHANNELS="--channel mantid/label/main --channel conda-forge"
+          VERSION=$(versioningit ../) conda mambabuild $CHANNELS --output-folder . .
+          conda verify noarch/drtsans*.tar.bz2