Replace use of intel channel, since it no longer works

See

https://www.intel.com/content/www/us/en/docs/oneapi/installation-guide-linux/2024-2/conda.html#GUID-BAA00723-86B2-4E54-9343-E817171F8A39

Author: oleksandr-pavlyk

.github/workflows/conda-package.yml

@@ -14,6 +14,7 @@ env:
   TEST_ENV_NAME: test_dpctl
   VER_SCRIPT1: "import json; f = open('ver.json', 'r'); j = json.load(f); f.close(); "
   VER_SCRIPT2: "d = j['dpctl'][0]; print('='.join((d[s] for s in ('version', 'build'))))"
+  INTEL_CHANNEL: "https://software.repos.intel.com/python/conda/"
 
 jobs:
   build_linux:
@@ -52,7 +53,7 @@ jobs:
       - name: Build conda package
         run: |
           # use bootstrap channel to pull NumPy linked with OpenBLAS
-          CHANNELS="-c dppy/label/bootstrap -c intel -c conda-forge --override-channels"
+          CHANNELS="-c dppy/label/bootstrap -c ${{ env.INTEL_CHANNEL }} -c conda-forge --override-channels"
           VERSIONS="--python ${{ matrix.python }} --numpy 1.23"
           TEST="--no-test"
           conda build \
@@ -108,7 +109,7 @@ jobs:
       - name: Build conda package
         env:
           OVERRIDE_INTEL_IPO: 1   # IPO requires more resources that GH actions VM provides
-        run: conda build --no-test --python ${{ matrix.python }} -c intel  -c conda-forge --override-channels conda-recipe
+        run: conda build --no-test --python ${{ matrix.python }} -c ${{ env.INTEL_CHANNEL }} -c conda-forge --override-channels conda-recipe
       - name: Upload artifact
         uses: actions/[email protected]
         with:
@@ -130,10 +131,14 @@ jobs:
         experimental: [false]
         runner: [ubuntu-20.04]
     continue-on-error: ${{ matrix.experimental }}
-    env:
-      CHANNELS: -c intel -c conda-forge --override-channels
 
     steps:
+      - name: Construct channels line
+        run: |
+          echo "CHANNELS=-c ${{ env.INTEL_CHANNEL }} -c conda-forge --override-channels" >> $GITHUB_ENV
+      - name: Display channels line
+        run: |
+          echo ${{ env.CHANNELS }}
       - name: Download artifact
         uses: actions/download-artifact@v4
         with:
@@ -221,9 +226,14 @@ jobs:
     continue-on-error: ${{ matrix.experimental }}
     env:
       workdir: '${{ github.workspace }}'
-      CHANNELS: -c intel -c conda-forge --override-channels
 
     steps:
+      - name: Construct channels line
+        run: |
+          echo "CHANNELS=-c ${{ env.INTEL_CHANNEL }} -c conda-forge --override-channels" >> $env:GITHUB_ENV
+      - name: Display channels line
+        run: |
+          echo ${{ env.CHANNELS }}
       - name: Download artifact
         uses: actions/download-artifact@v4
         with:
@@ -280,7 +290,7 @@ jobs:
             ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-
       - name: Install opencl_rt
         shell: cmd /C CALL {0}
-        run: conda install -n ${{ env.TEST_ENV_NAME }} opencl_rt -c intel --override-channels
+        run: conda install -n ${{ env.TEST_ENV_NAME }} opencl_rt -c ${{ env.INTEL_CHANNEL }} --override-channels
       - name: Install dpctl
         shell: cmd /C CALL {0}
         run: |
@@ -420,11 +430,16 @@ jobs:
         runner: [ubuntu-20.04]
     continue-on-error: ${{ matrix.experimental }}
     env:
-      CHANNELS: -c intel -c conda-forge --override-channels
       EXAMPLES_ENV_NAME: examples
       BUILD_ENV_NAME: build_env
 
     steps:
+      - name: Construct channels line
+        run: |
+          echo "CHANNELS="-c ${{ env.INTEL_CHANNEL }} -c conda-forge --override-channels" >> $GITHUB_ENV
+      - name: Display channels line
+        run: |
+          echo ${{ env.CHANNELS }}
       - name: Install conda-index
         # Needed to be able to run conda index
         run: conda install conda-index -c conda-forge --override-channels
@@ -484,7 +499,7 @@ jobs:
         shell: bash -l {0}
         run: |
           source $CONDA/etc/profile.d/conda.sh
-          CHANNELS="-c $GITHUB_WORKSPACE/channel -c dppy/label/dev -c intel -c conda-forge --override-channels"
+          CHANNELS="-c $GITHUB_WORKSPACE/channel -c dppy/label/dev -c ${{ env.INTEL_CHANNEL }} -c conda-forge --override-channels"
           export PACKAGE_VERSION=$(python -c "${VER_SCRIPT1} ${VER_SCRIPT2}")
           conda install -n ${{ env.EXAMPLES_ENV_NAME }} -y ${CHANNELS} dpctl=${PACKAGE_VERSION} dpnp || exit 1
       - name: Build and run examples of pybind11 extensions
@@ -570,9 +585,13 @@ jobs:
         experimental: [false]
         runner: [ubuntu-20.04]
     continue-on-error: ${{ matrix.experimental }}
-    env:
-      CHANNELS: -c intel -c conda-forge --override-channels
     steps:
+      - name: Construct channels line
+        run: |
+          echo "CHANNELS="-c ${{ env.INTEL_CHANNEL }} -c conda-forge --override-channels" >> $GITHUB_ENV
+      - name: Display channels line
+        run: |
+          echo ${{ env.CHANNELS }}
       - name: Checkout dpctl repo
         uses: actions/[email protected]
         with: