Implement release script and CI config

and add zeranoe ffmpeg 4.2.2 and rtmpdump 2.3

Author: bastimeyer

.github/workflows/main.yml

@@ -0,0 +1,14 @@
+name: Release
+
+on:
+  push: {}
+  pull_request: {}
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - env:
+          RELEASES_API_KEY: ${{ secrets.RELEASES_API_KEY }}
+        run: ./release.sh

data.json

@@ -0,0 +1,36 @@
+[
+    {
+        "url": "https://ffmpeg.zeranoe.com/builds/win32/static/ffmpeg-4.2.2-win32-static.zip",
+        "checksum": "1f6adff50db6cad54fdab15013c4c95cb6f83d7fe6d1167f3896cf4550573565",
+        "filename": "ffmpeg-4.2.2-win32-static.zip",
+        "sourcedir": "ffmpeg-4.2.2-win32-static",
+        "targetdir": "ffmpeg",
+        "files": [
+            {
+                "from": "bin/ffmpeg.exe",
+                "to": "ffmpeg.exe"
+            },
+            {
+                "from": "LICENSE.txt",
+                "to": "LICENSE.txt"
+            }
+        ]
+    },
+    {
+        "url": "https://rtmpdump.mplayerhq.hu/download/rtmpdump-2.3-windows.zip",
+        "checksum": "6948aa372f04952d5675917c6ca2c7c0bf6b109de21a4323adc93247fff0189f",
+        "filename": "rtmpdump-2.3-windows.zip",
+        "sourcedir": "rtmpdump-2.3",
+        "targetdir": "rtmpdump",
+        "files": [
+            {
+                "from": "rtmpdump.exe",
+                "to": "rtmpdump.exe"
+            },
+            {
+                "from": "COPYING",
+                "to": "LICENSE.txt"
+            }
+        ]
+    }
+]

release.sh

@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+set -e
+
+for var in GITHUB_ACTIONS GITHUB_REPOSITORY; do
+    [[ -z "${!var}" ]] && { echo >&2 "Missing ${var} env var"; exit 1; }
+done
+
+DATA="data.json"
+FILES=()
+
+GITHUB_API_URL="https://api.github.com/repos/${GITHUB_REPOSITORY}"
+GITHUB_API_HEADERS=(
+    -H "Accept: application/vnd.github.v3+json"
+    -H "User-Agent: ${GITHUB_REPOSITORY}"
+    -H "Authorization: token ${RELEASES_API_KEY}"
+)
+
+
+ROOT="$(git rev-parse --show-toplevel)"
+TEMP=$(mktemp -d) && trap "rm -rf ${TEMP}" EXIT || exit 255
+cd "${TEMP}"
+
+
+while IFS=" " read -r url checksum filename; do
+    echo "Downloading ${filename}"
+    curl -s -L --output "${filename}" "${url}"
+    echo "Comparing checksums"
+    echo "${checksum} ${filename}" | sha256sum --check -
+    FILES+=("${filename}")
+done < <(jq -r '.[] | "\(.url) \(.checksum) \(.filename)"' "${ROOT}/${DATA}")
+
+
+[[ "${GITHUB_REF}" =~ ^refs/tags/.+ ]] || { echo -e "Not a release, aborting\n\nDone"; exit 0; }
+[[ -z "${RELEASES_API_KEY}" ]] && { echo >&2 "Missing RELEASES_API_KEY env var"; exit 1; }
+
+
+TAG_NAME="${GITHUB_REF#refs/tags/}"
+
+echo "Checking for existing release on tag: ${TAG_NAME}"
+RELEASE_ID=$(curl -s \
+    -X GET \
+    "${GITHUB_API_HEADERS[@]}" \
+    "${GITHUB_API_URL}/releases/tags/${TAG_NAME}" \
+    | jq -r ".id | select(. != null)"
+)
+
+if [[ -n "${RELEASE_ID}" ]]; then
+    echo "Release found: ${RELEASE_ID}"
+else
+    RELEASE_ID=$(curl -s \
+        -X POST \
+        "${GITHUB_API_HEADERS[@]}" \
+        -d "{\"tag_name\":\"${TAG_NAME}\",\"name\":\"${TAG_NAME}\"}" \
+        "${GITHUB_API_URL}/releases" \
+        | jq -r ".id | select(. != null)"
+    )
+    if [[ -z "${RELEASE_ID}" ]]; then
+        echo >&2 "Could not create new release"
+        exit 1
+    fi
+    echo "New release created: ${RELEASE_ID}"
+fi
+
+for file in "${FILES[@]}"; do
+    echo "Uploading release asset: ${file}"
+    curl -s \
+        -X POST \
+        "${GITHUB_API_HEADERS[@]}" \
+        -H "Content-Type: application/octet-stream" \
+        -H "Content-Length: $(stat --printf="%s" "${file}")" \
+        --data-binary "@${file}" \
+        "https://uploads.github.com/repos/${GITHUB_REPOSITORY}/releases/${RELEASE_ID}/assets?name=${file}" \
+        > /dev/null
+done
+
+
+echo -e "\nDone"