CI: add PR focused workflow

Add workflow that will build the branch that is aimed at finally making
a PR to get the target into OpenWrt.

Signed-off-by: Robert Marko <robimarko@gmail.com>

.github/workflows/ipq807x.yaml

@@ -0,0 +1,84 @@
+name: Build IPQ807x
+on: [push]
+
+jobs:
+    build:
+        name: Prepare and build IPQ807x generic images
+        runs-on: ubuntu-latest
+
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v2
+
+            - name: Update and install feeds
+              run: |
+                ./scripts/feeds update -a
+                ./scripts/feeds install -a
+
+            - name: Generate config for IPQ807x Generic
+              run: |
+                echo "CONFIG_TARGET_ipq807x=y" > .config
+                echo "CONFIG_TARGET_ipq807x_generic=y\n" >> .config
+                echo "CONFIG_TARGET_MULTI_PROFILE=y\n" >> .config
+                echo "CONFIG_TARGET_ALL_PROFILES=y\n" >> .config
+                echo "CONFIG_TARGET_PER_DEVICE_ROOTFS=y\n" >> .config
+                echo "CONFIG_TARGET_ROOTFS_INITRAMFS=y\n" >> .config
+                echo "CONFIG_TARGET_INITRAMFS_COMPRESSION_ZSTD=y\n" >> .config
+                echo "CONFIG_PACKAGE_luci=y\n" >> .config
+                echo "CONFIG_PACKAGE_wpad-basic-wolfssl=m\n" >> .config
+                echo "CONFIG_PACKAGE_wpad-wolfssl=y\n" >> .config
+                make defconfig
+
+            - name: Download package sources
+              run: make download V=s
+
+            - name: Build tools
+              run: |
+                make tools/install -j$(nproc) V=s || \
+                make tools/install V=s
+
+            - name: Build toolchain
+              run: |
+                make toolchain/install -j$(nproc) V=s || \
+                make toolchain/install V=s
+
+            - name: Build target images
+              run: |
+                make -j$(nproc) V=s || \
+                make V=s
+
+            - name: TAR output
+              run: tar -cvf ipq807xx-images.tar bin/targets/ipq807x/generic
+
+            - name: Upload artifacts
+              uses: actions/upload-artifact@v2
+              with:
+                name: ipq807x-images
+                path: ipq807xx-images.tar
+
+    release:
+          name: Make a release
+          runs-on: ubuntu-latest
+          needs: build
+
+          steps:
+            - name: Download the image artifacts
+              uses: actions/download-artifact@v2
+              with:
+                name: ipq807x-images
+
+            - name: Extract the image artifacts
+              run: tar xf ipq807xx-images.tar
+
+            - name: Get the current date
+              run: echo "NOW=$(date +%F-%H%M)" >> $GITHUB_ENV
+
+            - name: Create a release
+              uses: "lauravuo/action-automatic-releases@test-changes"
+              with:
+                repo_token: "${{ secrets.GITHUB_TOKEN }}"
+                prerelease: true
+                title: "Updated prebuilt images ${{ env.NOW }}"
+                automatic_release_tag: "ipq807x-${{ env.NOW }}"
+                auto_generate_release_notes: true
+                files: bin/targets/ipq807x/generic/*