Fix evaluation of step conditions

Despite specifying the boolean type for inputs, GitHub workflow
variables are actually strings so 'false' evaluates to true. This was
causing the seed container image build to always be executed.

See actions/runner#1483 for more details.

Author: priteau

.github/workflows/container-image-build.yml

@@ -88,25 +88,25 @@ jobs:
           kayobe overcloud container image build ${{ github.event.inputs.regexes }} --push
         env:
           KAYOBE_VAULT_PASSWORD: ${{ secrets.KAYOBE_VAULT_PASSWORD }}
-        if: github.event.inputs.overcloud
+        if: github.event.inputs.overcloud == 'true'
 
       - name: Display the overcloud container image tag
         run: |
           echo "$(cat ~/kolla_tag)"
-        if: github.event.inputs.overcloud
+        if: github.event.inputs.overcloud == 'true'
 
       - name: Get built overcloud container images
         run: |
           sudo docker image ls --filter "reference=ark.stackhpc.com/stackhpc-dev/*:$(cat ~/kolla_tag)" > overcloud-container-images
-        if: github.event.inputs.overcloud
+        if: github.event.inputs.overcloud == 'true'
 
       - name: Upload overcloud-container-images artifact
         uses: actions/upload-artifact@v3
         with:
           name: Overcloud container images
           path: overcloud-container-images
           retention-days: 7
-        if: github.event.inputs.overcloud
+        if: github.event.inputs.overcloud == 'true'
 
       - name: Build and push kolla seed images
         run: |
@@ -115,25 +115,25 @@ jobs:
           kayobe seed container image build --push
         env:
           KAYOBE_VAULT_PASSWORD: ${{ secrets.KAYOBE_VAULT_PASSWORD }}
-        if: github.event.inputs.seed
+        if: github.event.inputs.seed == 'true'
 
       - name: Display the seed container image tag
         run: |
           echo "$(cat ~/kolla_tag)"
-        if: github.event.inputs.seed
+        if: github.event.inputs.seed == 'true'
 
       - name: Get built seed container images
         run: |
           sudo docker image ls --filter "reference=ark.stackhpc.com/stackhpc-dev/*:$(cat ~/kolla_tag)" > seed-container-images
-        if: github.event.inputs.seed
+        if: github.event.inputs.seed == 'true'
 
       - name: Upload seed-container-images artifact
         uses: actions/upload-artifact@v3
         with:
           name: Seed container images
           path: seed-container-images
           retention-days: 7
-        if: github.event.inputs.seed
+        if: github.event.inputs.seed == 'true'
 
       - name: Prune local Kolla container images
         run: |