GitHub Actions files cleanup (facebookresearch#3454)

Summary:
Pull Request resolved: facebookresearch#3454

Removing commented out lines and adding proper descriptions and comments where appropriate.

Reviewed By: junjieqi

Differential Revision: D57501602

fbshipit-source-id: 0202ff73b7a83158808affba9b98b96dff569457

.github/actions/build_cmake/action.yml

@@ -1,15 +1,15 @@
 name: Build cmake
 inputs:
   opt_level:
-    description: 'The optimization level'
+    description: 'Compile options / optimization level.'
     required: false
     default: generic
   gpu:
-    description: 'The GPU to use'
+    description: 'Enable GPU support.'
     required: false
     default: OFF
   raft:
-    description: 'The raft to use'
+    description: 'Enable RAFT support.'
     required: false
     default: OFF
 runs:
@@ -20,12 +20,12 @@ runs:
       with:
         python-version: '3.11'
         miniconda-version: latest
-    - name: Set up environment
+    - name: Initialize Conda environment
       shell: bash
       run: |
         conda config --set solver libmamba
         conda update -y -q conda
-    - name: Configure conda environment
+    - name: Configure Conda environment
       shell: bash
       run: |
         conda install -y -q -c conda-forge gxx_linux-64=11.2 sysroot_linux-64=2.28

.github/actions/build_conda/action.yml

@@ -1,21 +1,21 @@
-name: Build conda
-description: Build conda
+name: Conda build
+description: Builds FAISS inside a Conda environment and uploads to repository when label is provided.
 inputs:
   label:
-    description: "Label"
+    description: "The label to be used for uploads to Conda."
     default: ""
     required: false
   cuda:
-    description: "cuda"
+    description: "CUDA toolkit version to use."
     default: ""
     required: false
   raft:
-    description: "raft"
+    description: "Enable RAFT support."
     default: ""
     required: false
   compiler_version:
     description: "compiler_version"
-    default: ""
+    default: "Compiler version for C/C++/CUDA."
     required: false
 runs:
   using: composite
@@ -24,7 +24,7 @@ runs:
       shell: bash
       id: choose_shell
       run: |
-        # if runner.os != 'Windows' use bash, else use pwsh
+        # Use pwsh on Windows; bash everywhere else
         if [ "${{ runner.os }}" != "Windows" ]; then
           echo "shell=bash" >> "$GITHUB_OUTPUT"
         else
@@ -38,8 +38,6 @@ runs:
     - name: Install conda build tools
       shell: ${{ steps.choose_shell.outputs.shell }}
       run: |
-        # conda config --set solver libmamba
-        # conda config --set verbosity 3
         conda update -y -q conda
         conda install -y -q conda-build
     - name: Enable anaconda uploads