ci: missing concurrency checks

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

.github/workflows/build.yml

@@ -1,5 +1,9 @@
 name: build
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 on:
   push:
     # needs push event on default branch otherwise cache is evicted when pull request is merged

.github/workflows/deploy.yml

@@ -1,5 +1,9 @@
 name: deploy
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 on:
   workflow_dispatch:
   push:

.github/workflows/merge.yml

@@ -1,5 +1,9 @@
 name: merge
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 # open or update publishing PR when there is a push to main
 on:
   workflow_dispatch: