Fix environment var formatting

Author: abkfenris

.github/workflows/push.yml

@@ -1,7 +1,6 @@
 name: Push
 
 on: [push, workflow_dispatch]
-
 env:
   BUILDX_CACHE: /tmp/.buildx-cache
   CACHE_KEY: docker-erddap-buildx-
@@ -22,10 +21,10 @@ jobs:
     - name: Cache Docker layers
       uses: actions/cache@v2
       with:
-        path: ${{ BUILDX_CACHE }}
-        key: ${{ CACHE_KEY }}${{ github.sha }}
+        path: ${ BUILDX_CACHE }
+        key: ${ CACHE_KEY }${{ github.sha }}
         restore-keys: |
-          ${{ CACHE_KEY }}
+          ${ CACHE_KEY }
     
     - name: Login to Docker Hub
       uses: docker/login-action@v1
@@ -39,8 +38,8 @@ jobs:
       with:
         push: false
         tags: axiom/docker-erddap:latest
-        cache-from: type=local,src=${{ BUILDX_CACHE }}
-        cache-to: type=local,dest=${{ BUILDX_CACHE }}
+        cache-from: type=local,src=${ BUILDX_CACHE }
+        cache-to: type=local,dest=${ BUILDX_CACHE }
 
     - name: Run Docker Image in Background
       run: docker run -d -p 8080:8080 axiom/docker-erddap:latest
@@ -68,8 +67,8 @@ jobs:
     - name: Cache Docker layers
       uses: actions/cache@v2
       with:
-        path: ${{ BUILDX_CACHE }}
-        key: ${{ CACHE_KEY }}${{ github.sha }}
+        path: ${ BUILDX_CACHE }
+        key: ${ CACHE_KEY }${{ github.sha }}
         restore-keys: |
           ${{ CACHE_KEY }}
     
@@ -84,5 +83,5 @@ jobs:
       with:
         push: true
         tags: axiom/docker-erddap:latest
-        cache-from: type=local,src=${{ BUILDX_CACHE }}
-        cache-to: type=local,dest=${{ BUILDX_CACHE }}
+        cache-from: type=local,src=${ BUILDX_CACHE }
+        cache-to: type=local,dest=${ BUILDX_CACHE }