ci: docker build: enable GHA cache

Signed-off-by: Marc 'risson' Schmitt <marc.schmitt@risson.space>

.github/workflows/ci-main.yml

@@ -220,6 +220,8 @@ jobs:
             GIT_BUILD_HASH=${{ steps.ev.outputs.sha }}
             VERSION=${{ steps.ev.outputs.version }}
             VERSION_FAMILY=${{ steps.ev.outputs.versionFamily }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
       - name: Comment on PR
         if: github.event_name == 'pull_request'
         continue-on-error: true
@@ -266,3 +268,5 @@ jobs:
             VERSION=${{ steps.ev.outputs.version }}
             VERSION_FAMILY=${{ steps.ev.outputs.versionFamily }}
           platforms: linux/arm64
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

.github/workflows/ci-outpost.yml

@@ -99,6 +99,8 @@ jobs:
             VERSION_FAMILY=${{ steps.ev.outputs.versionFamily }}
           platforms: linux/amd64,linux/arm64
           context: .
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
   build-binary:
     timeout-minutes: 120
     needs: