fix invalid expression syntax

Author: LongLiveCHIEF

.github/workflows/build.yml

@@ -24,7 +24,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     needs: filters
-    if: needs.filters.outputs.found_main_changes
+    if: ${{ needs.filters.outputs.found_main_changes }}
 
     steps:
       - uses: actions/checkout@v2

.github/workflows/octoprint-release.yml

@@ -27,7 +27,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     needs: filters
-    if: github.event_name == 'repository_dispatch' || needs.filters.outputs.found_main_changes == 'true'
+    if: ${{ github.event_name == 'repository_dispatch' || needs.filters.outputs.found_main_changes == 'true' }}
     strategy:
       matrix:
         tags: ['latest','%X%', '%X.Y%', '%X.Y.Z%']
@@ -70,7 +70,7 @@ jobs:
         id: build_deploy
         #if matrix tag is latest AND tag_name is NOT equal to latest-octoprint don't build
         # this allows rebuilds of older versions without changing 'latest' to an old release
-        if: !(env.tag_name == 'latest' && ( steps.latest-octprint.outputs.release != env.tag_name ))
+        if: ${{!(env.tag_name == 'latest' && ( steps.latest-octprint.outputs.release != env.tag_name ))}}
         run: |
           docker buildx build --push \
             --platform linux/arm64,linux/amd64,linux/arm/v7 \