workflow: small fix in build workflow

Fix for a typo.

Signed-off-by: Giacomo Dematteis <giacomo.dematteis@nordicsemi.no>

Author: DematteisGiacomo

.github/workflows/build.yml

@@ -85,11 +85,12 @@ jobs:
           cat app/VERSION
 
       - name: Set MEMFAULT_FW_TYPE and MEMFAULT_FW_VERSION_PREFIX
+        shell: bash
         run: |
-          if [ -z "${{ inputs.memfault_sw_type }}" ]; then
+          if [[ -z "${{ inputs.memfault_fw_type }}" ]]; then
             echo "MEMFAULT_FW_TYPE=asset-tracker-template-dev" >> $GITHUB_ENV
           else
-            echo "MEMFAULT_FW_TYPE=${{ inputs.memfault_sw_type }}" >> $GITHUB_ENV
+            echo "MEMFAULT_FW_TYPE=${{ inputs.memfault_fw_type }}" >> $GITHUB_ENV
           fi
 
           if [[ "${{ startsWith(github.ref, 'refs/tags/') }}" == "true" ]]; then