fix(docker-build): fix build-cache validation (#61)

Author: cesarcoatl

Diff for: .github/workflows/docker-build-push-multi-platform.yml

@@ -111,7 +111,7 @@ jobs:
           provenance: ${{ inputs.build-provenance }}
 
       - name: Export digest (cached)
-        if: ${{ inputs.build-cache == 'true' }}
+        if: ${{ inputs.build-cache }}
         run: |
           mkdir -p ${{ runner.temp }}/digests
           digest="${{ steps.build-cache.outputs.digest }}"
@@ -131,7 +131,7 @@ jobs:
           provenance: ${{ inputs.build-provenance }}
 
       - name: Export digest (no cache)
-        if: ${{ inputs.build-cache == 'false' }}
+        if: ${{ ! inputs.build-cache }}
         run: |
           mkdir -p ${{ runner.temp }}/digests
           digest="${{ steps.build-no-cache.outputs.digest }}"

Diff for: .github/workflows/docker-build-push-multi-registry.yml

@@ -126,13 +126,14 @@ jobs:
           provenance: false
 
       - name: Export digest (cached)
+        if: ${{ inputs.build-cache }}
         run: |
           mkdir -p ${{ runner.temp }}/digests
           digest="${{ steps.build-cache.outputs.digest }}"
           touch "${{ runner.temp }}/digests/${digest#sha256:}"
 
       - name: Build and push by digest (no cache)
-        if: ${{ inputs.build-cache }}
+        if: ${{ ! inputs.build-cache }}
         id: build-no-cache
         uses: docker/build-push-action@v6
         with:
@@ -145,6 +146,7 @@ jobs:
           provenance: false
 
       - name: Export digest (no cache)
+        if: ${{ ! inputs.build-cache }}
         run: |
           mkdir -p ${{ runner.temp }}/digests
           digest="${{ steps.build-no-cache.outputs.digest }}"