Adding workflow to build a container image (#4)

* Adding workflow to build a container image

* fixing action version

* fixing action version

* fixing action version

* fixing action version

* fixing action version

* fixing docker container tag

* Adding workflow to automatically push a container image to the container registry

Author: cybcon

.github/workflows/build-container-image.yaml

@@ -0,0 +1,38 @@
+name: build-container-image
+on:
+  pull_request:
+    types:
+      - opened
+      - edited
+      - synchronize
+      - reopened
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+     - name: Checkout GIT repository
+       uses: actions/checkout@v3
+     - name: Get the application version
+       id: application-version
+       run: |
+         image_version=$(grep "^LABEL site.local.program.version=" Dockerfile | cut -d= -f2 | sed -e 's/"//g')
+         if [ -z "${image_version}" ]; then
+           echo "ERROR: unable to detect version number!" >&2
+           exit 1
+         fi
+         echo "tag=${image_version}" >> $GITHUB_OUTPUT
+     - name: Build container image
+       run: |
+         docker build . --file Dockerfile --tag oitc/modbus-server:${{steps.application-version.outputs.tag}}
+     - name: Export container image for caching
+       run: |
+         docker save --output oitc-modbus-server_${{steps.application-version.outputs.tag}}.tar oitc/modbus-server:${{steps.application-version.outputs.tag}}
+
+     - name: Upload the container image for caching
+       uses: actions/upload-artifact@v3.1.2
+       with:
+         name: modbus-server
+         path: oitc-modbus-server_${{steps.application-version.outputs.tag}}.tar
+         if-no-files-found: error
+         retention-days: 1

.github/workflows/pre-commit.yaml

@@ -3,7 +3,6 @@ on:
   pull_request:
   push:
     branches:
-      - master
       - main
 jobs:
   pre-commit:

.github/workflows/upload-container-image.yaml

@@ -0,0 +1,34 @@
+name: build-container-image
+on:
+  pull_request:
+    types:
+      - closed
+jobs:
+  build:
+    name: Push Container Image
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download container image from cache
+        uses: actions/download-artifact@v3.0.2
+        with:
+          name: modbus-server
+      - name: Identify container version
+        id: vars
+        run: |
+          container_image_file=$(find . -name "oitc-modbus-server_*.tar" -type -f | tail -1)
+          if [ -z "${container_image_file}" ]; then
+            echo "ERROR: Unable to get the container image file!" >&2
+            exit 1
+          fi
+          container_version=$(basename ${container_image_file} | cut -d_ -f2 | sed -e 's/\.tar$//')
+          image_name="oitc/modbus-server:${container_version}"
+
+          echo "container_image_file=${container_image_file}" >> $GITHUB_OUTPUT
+          echo "container_version=${container_version}" >> $GITHUB_OUTPUT
+          echo "image_name=${image_name}" >> $GITHUB_OUTPUT
+      - name: Import container image
+        run: docker import ${{steps.vars.outputs.container_image_file}}
+      - name: Login to container registry
+        run: echo ${{ secrets.DOCKERHUB_PASSWORD }} | docker login -u ${{ secrets.DOCKERHUB_USERNAME }} --password-stdin
+      - name: Upload container image to container registry
+        run: docker push ${{steps.vars.outputs.image_name}}