[ ci ] Make Agda binary distributable hence cachable

.github/workflows/test.yml

@@ -41,9 +41,11 @@ jobs:
           cabal-update: false
           enable-stack: true
 
+      # $DIST is where the binary & its dependencies is placed
       - name: 🛠️ Setting variables
         run: | 
           echo "STACK_LOCAL_BIN=$(stack path --local-bin)" >> "$GITHUB_ENV"
+          echo "DIST=${{ matrix.agda }}-${{ matrix.os }}"  >> "$GITHUB_ENV"
 
       - name: 🔍 Reviewing variables
         run: |
@@ -53,7 +55,8 @@ jobs:
           echo "stack-path        = ${{ steps.haskell-setup.outputs.stack-path  }}"
           echo "stack-exe         = ${{ steps.haskell-setup.outputs.stack-exe   }}"
           echo "stack-root        = ${{ steps.haskell-setup.outputs.stack-root  }}"
-          echo "STACK_LOCAL_BIN    = $STACK_LOCAL_BIN"
+          echo "STACK_LOCAL_BIN   = $STACK_LOCAL_BIN"
+          echo "DIST              = $DIST"
     
       # cached stuff to be restored:
       - name: 💾 Restore cached stack global package db
@@ -94,6 +97,23 @@ jobs:
           which agda
           agda --version
 
+      - name: 📦 Move artefacts to ${{ env.DIST }}
+        continue-on-error: true
+        run: |
+          dist=${{ env.DIST }}
+
+          if [[ ${{ runner.os }} == "Windows" ]]; then
+            ls "${{ env.STACK_LOCAL_BIN }}"
+            cp "${{ env.STACK_LOCAL_BIN }}"/agda "${dist}"/agda
+
+          else
+            cp ${{ env.STACK_LOCAL_BIN }}/agda "${dist}"/agda
+            strip "${dist}"/agda
+          fi
+
+          ls "${dist}"
+          file "${dist}"/agda
+
       # things to be cached
       - name: 💾 Cache stack global package db
         if:   always() && env.AGDA_INSTALLED != '0' && steps.stack-global.outputs.cache-hit != 'true'