ci: fix clang-format workflow. add build workflow.

.github/workflows/clang-format.yml

@@ -1,18 +1,18 @@
 name: clang-format-review
 
 # You can be more specific, but it currently only works on pull requests
-on: [pull_request]
+on: [push, pull_request]
 
 jobs:
   clang-format:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Install clang-tidy
         run: |
           sudo apt-get update
           sudo apt-get install -y clang-tidy
       - name: Analyze
         run: |
           clang-format --dry-run --Werror -style=file $(find ./ -name '*.cpp' -print)
-          clang-format --dry-run --Werror -style=file $(find ./ -name '*.hpp' -print)
+          clang-format --dry-run --Werror -style=file $(find ./ -name '*.h' -print)

.github/workflows/tetra-decoder-x86_64.yml

@@ -0,0 +1,12 @@
+
+name: "tetra-decoder-x86_64"
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v17
+      - run: nix build -vL .\?submodules=1#