fix: multi-platform docker build cache misses due to overwriting othe…

…r platforms

.github/actions/docker/action.yaml

@@ -86,6 +86,7 @@ runs:
         region: ${{ inputs.cache_region }}
         bucket: ${{ inputs.cache_bucket }}
         endpoint: ${{ inputs.cache_endpoint }}
+        prefix: "cache-layers/${{ inputs.platform }}/"
         cache_to_name: ${{ inputs.cache_to_name }}
 
     - name: Set HOME variable to github context
@@ -160,6 +161,7 @@ runs:
         endpoint: ${{ inputs.cache_endpoint }}
         access_key_id: ${{ inputs.cache_access_key_id }}
         secret_access_key: ${{ inputs.cache_secret_access_key }}
+        platform: ${{ inputs.platform }}
         install: false
 
     - name: Build and push Docker image ${{ inputs.image }}

.github/actions/sccache/action.yaml

@@ -17,6 +17,9 @@ inputs:
   secret_access_key:
     description: S3 endpoint secret access key
     required: true
+  platform:
+    description: "Platform and architecture to use when caching; helps to avoid invalid cache on different arch"
+    required: true
   install:
     description: "Install sccache"
     default: "true"
@@ -50,6 +53,6 @@ runs:
         echo "SCCACHE_BUCKET=${{ inputs.bucket }}" >> $GITHUB_ENV
         echo "SCCACHE_REGION=${{ inputs.region }}" >> $GITHUB_ENV
         echo "SCCACHE_ENDPOINT=${{ inputs.endpoint }}" >> $GITHUB_ENV
-        echo "SCCACHE_S3_KEY_PREFIX=${{ runner.os }}/sccache/${{ runner.arch }}/linux-gnu" >> $GITHUB_ENV
+        echo "SCCACHE_S3_KEY_PREFIX=${{ runner.os }}/sccache/${{ inputs.platform }}/" >> $GITHUB_ENV
         # "SCCACHE_VERSION" is used inside Docker to install the same version of sccache
         echo "SCCACHE_VERSION=${{ inputs.version }}" >> $GITHUB_ENV