Update RC labels of Conda packages according to version number

If alpha or RC, then deduce the label RC. Otherwise, use the default
(main) label.

Note: in meta.yaml the RC label is hard-coded for the current alpha
release, as there is no documented way of parameterizing the label
without dynamically modifying the file.

Author: popescu-v

.github/workflows/conda.yml

@@ -103,7 +103,8 @@ jobs:
           echo "KHIOPS_CORE_VERSION=$KHIOPS_CORE_VERSION" >> "$GITHUB_ENV"
       - name: Install the Khiops Conda package
         run: |
-          conda install khiops-core=$KHIOPS_CORE_VERSION
+          if [[ $(echo ${KHIOPS_CORE_VERSION} | grep -E ".*-(a|rc)\.[0-9]+") ]]; then RC_LABEL="conda-forge/label/rc::"; else RC_LABEL=""; fi \
+          conda install ${RC_LABEL}khiops-core=$KHIOPS_CORE_VERSION
           conda install --channel ./khiops-conda/ khiops
       - name: Test Khiops Installation Status
         run: kh-status

packaging/docker/khiopspydev/Dockerfile.rocky

@@ -71,6 +71,7 @@ RUN true \
 ARG PYTHON_VERSIONS
 RUN true \
   && export CONDA="/root/miniforge3/bin/conda" \
+  && if [[ $(echo ${KHIOPS_REVISION} | grep -E ".*-(a|rc)\.[0-9]+") ]]; then export RC_LABEL="conda-forge/label/rc::"; else export RC_LABEL=""; fi \
   && /bin/bash -c 'for version in ${PYTHON_VERSIONS}; \
     do \
         CONDA_ENVS="py${version} py${version}_conda"; \

packaging/docker/khiopspydev/Dockerfile.ubuntu

@@ -44,6 +44,7 @@ ARG KHIOPS_GCS_DRIVER_REVISION
 ARG KHIOPS_S3_DRIVER_REVISION
 RUN true \
   && export CONDA="/root/miniforge3/bin/conda" \
+  && if [[ $(echo ${KHIOPS_REVISION} | grep -E ".*-(a|rc)\.[0-9]+") ]]; then export RC_LABEL="conda-forge/label/rc::"; else export RC_LABEL=""; fi \
   && /bin/bash -c 'for version in ${PYTHON_VERSIONS}; \
     do \
         CONDA_ENVS="py${version} py${version}_conda"; \
@@ -52,7 +53,7 @@ RUN true \
             $CONDA create -y -n $CONDA_ENV python=${version}; \
         done; \
         # khiops core \
-        $CONDA install -y -n py${version}_conda khiops-core=$(echo ${KHIOPS_REVISION} | tr -d "-") ; \
+        $CONDA install -y -n py${version}_conda ${RC_LABEL}khiops-core=$(echo ${KHIOPS_REVISION} | tr -d "-") ; \
         # remote files drivers installed in the conda environment \
         $CONDA install -y -n py${version}_conda -c khiops \
         khiops-driver-s3=${KHIOPS_S3_DRIVER_REVISION} \