add github action to test decoders

.github/workflows/test_decoders.yaml

@@ -0,0 +1,51 @@
+name: "Test Decoders"
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    paths:
+      - 'internal/decoders/**'
+  push:
+    branches:
+      - 'main'
+    paths:
+      - 'internal/decoders/**'
+
+jobs:
+  test_decoders:
+    name: "test decoders"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: ^1.23
+
+      # When you execute your unit tests, make sure to use the "-coverprofile" flag to write a 
+      # coverage profile to a file. You will need the name of the file (e.g. "coverage.txt")
+      # in the next step as well as the next job.
+      - name: Test
+        run: go test -cover -coverprofile=coverage.txt ./internal/decoders/...
+
+      - name: Archive code coverage results
+        uses: actions/upload-artifact@v4
+        with:
+          name: decoders-code-coverage
+          path: decoders_coverage.txt # Make sure to use the same file name you chose for the "-coverprofile" in the "Test" step
+
+  code_coverage:
+    name: "Code coverage report"
+    if: github.event_name == 'pull_request' # Do not run when workflow is triggered by push to main branch
+    runs-on: ubuntu-latest
+    needs: test_decoders
+    permissions:
+      contents:      read
+      actions:       read
+      pull-requests: write
+    steps:
+      - uses: fgrosse/go-coverage-report@v1.1.1 # Consider using a Git revision for maximum security
+        with:
+          coverage-artifact-name: "decoders-code-coverage" # can be omitted if you used this default value
+          coverage-file-name: "decoders_coverage.txt" # can be omitted if you used this default value