Add checksum step for release workflow (#102)

Signed-off-by: thepetk <thepetk@gmail.com>

Author: thepetk

.github/workflows/release.yaml

@@ -1,7 +1,7 @@
 on:
   push:
     tags:
-      - 'v*'
+      - "v*"
 
 name: Build Release
 
@@ -15,25 +15,25 @@ permissions:
 jobs:
   release:
     name: Create Release
-    runs-on: 'ubuntu-latest'
+    runs-on: "ubuntu-latest"
     strategy:
       matrix:
         goosarch:
-          - 'darwin/amd64'
-          - 'darwin/arm64'
-          - 'linux/amd64'
-          - 'linux/arm64'
-          - 'linux/ppc64le'
-          - 'linux/s390x'
-          - 'windows/amd64'
+          - "darwin/amd64"
+          - "darwin/arm64"
+          - "linux/amd64"
+          - "linux/arm64"
+          - "linux/ppc64le"
+          - "linux/s390x"
+          - "windows/amd64"
     steps:
       - name: Checkout code
         uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
         with:
           fetch-depth: 0
       - uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe # v4.1.0
         with:
-          go-version-file: 'go.mod'
+          go-version-file: "go.mod"
       - name: Get OS and arch info
         run: |
           GOOSARCH=${{matrix.goosarch}}
@@ -47,15 +47,24 @@ jobs:
             BINARY_NAME=alizer-$RELEASE_VERSION-$GOOS-$GOARCH
           fi
           echo "BINARY_NAME=$BINARY_NAME" >> $GITHUB_ENV
+          echo "HASHFILE_NAME=$BINARY_NAME.sha256" >> $GITHUB_ENV
           echo "GOOS=$GOOS" >> $GITHUB_ENV
           echo "GOARCH=$GOARCH" >> $GITHUB_ENV
       - name: Build
         run: |
-          go build -o "$BINARY_NAME" -v
+          go build -o ${{env.BINARY_NAME}} -v
+      - name: Generate sha256 checksum
+        uses: jmgilman/actions-generate-checksum@3ea6dc9bf8eecf28e2ecc982fab683484a1a8561 # v1.0.1
+        with:
+          output: ${{env.HASHFILE_NAME}}
+          method: sha256
+          patterns: ${{env.BINARY_NAME}}
       - name: Release with Notes and Binaries
         uses: softprops/action-gh-release@de2c0eb89ae2a093876385947365aca7b0e5f844 # v0.1.15
         with:
           draft: false
-          files: ${{env.BINARY_NAME}}
+          files: |
+            ${{env.BINARY_NAME}}
+            ${{env.HASHFILE_NAME}}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}